CakePHP-Kurzanleitung

CakePHP – Übersicht

CakePHP ist ein Open-Source-MVC-Framework. Es erleichtert die Entwicklung, Bereitstellung und Wartung von Anwendungen erheblich. CakePHP verfügt über eine Reihe von Bibliotheken, um die Überlastung der häufigsten Aufgaben zu reduzieren.

Vorteile von CakePHP

Die Vorteile der Verwendung von CakePHP sind unten aufgeführt −

• Open Source

• MVC-Framework

• Templating Engine

• Caching-Vorgänge

• Suchmaschinenfreundliche URLs

• Einfache CRUD-Datenbankinteraktionen (Erstellen, Lesen, Aktualisieren, Löschen).

• Bibliotheken und Helfer

• Integrierte Validierung

• Lokalisierung

• E-Mail-, CakePHP-Kurzanleitung-, Sicherheits-, Sitzungs- und Anforderungsverarbeitungskomponenten

• Hilfsprogramme für AJAX, JavaScript, HTML-Formulare und mehr anzeigen

CakePHP-Anfragezyklus

Die folgende Abbildung beschreibt, wie ein Anforderungslebenszyklus in CakePHP funktioniert −

Ein typischer CakePHP-Anfragezyklus beginnt damit, dass ein Benutzer eine Seite oder Ressource in Ihrer Anwendung anfordert. Auf hoher Ebene durchläuft jede Anfrage die folgenden Schritte −

• Die Webserver-Umschreibungsregeln leiten die Anfrage an webroot / index.php weiter.

• Die Autoloader- und Bootstrap-Dateien Ihrer Anwendung werden ausgeführt.

• Alle konfigurierten Versandfilter können die Anfrage verarbeiten und optional eine Antwort generieren.

• Der Dispatcher wählt den geeigneten CakePHP-Kurzanleitung und die entsprechende Aktion basierend auf Routing-Regeln aus.

• Die Aktion des CakePHP-Kurzanleitungs wird aufgerufen und der CakePHP-Kurzanleitung interagiert mit den erforderlichen Modellen und Komponenten.

• Der CakePHP-Kurzanleitung delegiert die Antworterstellung an die Ansicht, um die aus den Modelldaten resultierende Ausgabe zu generieren.

• Die Ansicht verwendet Helfer und Zellen, um den Antworttext und die Header zu generieren.

• Die Antwort wird an den Kunden zurückgesendet.

CakePHP - Installation

In diesem Kapitel zeigen wir die Installation von CakePHP 4.0.3. Die minimale PHP-Version, die wir installieren müssen, ist PHP 7.3.

Sie müssen PHP 7.3 und Composer installiert haben, bevor Sie mit der Installation von cakePHP beginnen.

Für Windows-Benutzer installieren oder aktualisieren Sie den WAMP-Server mit der PHP-Version > 7.3.

Gehen Sie zu www.wampserver.com/en/download-wampserver-64bits/ und installieren Sie es.

Linux-Benutzer finden für die Installation von PHP bitte die Tutorials Point-Website unter www.tutorialspoint.com/php7/php7_installation_linux.htm.

Composer installieren

Gehen Sie zu Composer unter https://getcomposer.org/download/, klicken Sie entsprechend dem Betriebssystem (OS) Ihres Computers auf „Download“ und installieren Sie Composer auf Ihrem System. Fügen Sie den Speicherort zur PATH-Variablen für Windows-Benutzer hinzu, damit Sie Composer von jedem Verzeichnis aus verwenden können.

Sobald Sie mit der Installation von Composer fertig sind, beginnen wir nun mit der Installation von CakePHP.

CakePHP installieren

Gehen Sie zu dem Ordner, in dem sich wamp für Windows-Benutzer befindet, und erstellen Sie im Ordner www/ einen Ordner cakephp4/.

Für Linux-Benutzer erstellen Sie den Ordner var/www/html/ und dann den Ordner cakephp4/.

• cakephp4/ ist der Ordner, in dem wir CakePHP installieren werden.

Verwenden Sie Composer, um den folgenden Befehl auszuführen −

composer create-project --prefer-dist cakephp/app:4.0.3 cakephp4

Das sollten Sie sehen, wenn der Befehl ausgeführt wird −

Sobald die Installation abgeschlossen ist, verwenden Sie localhost, um Ihr Projekt im Browser zu öffnen.

Der Pfad dafür ist http://localhost/cakephp.

CakePHP – Ordnerstruktur

Hier erfahren Sie mehr über die Ordnerstruktur und die CakePHP-Kurzanleitungnskonvention in CakePHP. Beginnen wir damit, die Ordnerstruktur zu verstehen.

Ordnerstruktur

Sehen Sie sich den folgenden Screenshot an. Es zeigt die Ordnerstruktur von CakePHP.

Die folgende Tabelle beschreibt die Rolle jedes Ordners in CakePHP −

Sr.Nr.	Ordnername und Beschreibung
1	Mülleimer Der Ordner bin enthält die ausführbaren Dateien der Cake-Konsole.
2	config Der Ordner config enthält die (wenigen) Konfigurationsdateien, die CakePHP verwendet. Hier sollten Datenbankverbindungsdetails, Bootstrapping, Kernkonfigurationsdateien und mehr gespeichert werden.
3	Protokolle Der Ordner Protokolle enthält normalerweise Ihre Protokolldateien, abhängig von Ihrer Protokollkonfiguration.
4	Plugins Im Plugins-Ordner werden die von Ihrer Anwendung verwendeten Plugins gespeichert.
5	Ressourcen Die Dateien für die Internationalisierung im jeweiligen Locale-Ordner werden hier gespeichert. Z.B. locales/en_US.
6	src Der Ordner src ist der Ort, an dem Sie Ihre Magie entfalten können. Hier werden die Dateien Ihrer Anwendung abgelegt und Sie werden den Großteil Ihrer Anwendungsentwicklung durchführen. Schauen wir uns die Ordner in src. etwas genauer an Konsole – Enthält die Konsolenbefehle und Konsolenaufgaben für Ihre Anwendung. CakePHP-Kurzanleitung – Enthält die CakePHP-Kurzanleitung Ihrer Anwendung und deren Komponenten. Modell – Enthält die Tabellen, Entitäten und Verhaltensweisen Ihrer Anwendung. Präsentationsklassen anzeigen werden hier platziert: Zellen, Helfer und Vorlagendateien.
7	Vorlagen Vorlagenpräsentationsdateien werden hier platziert: Elemente, Fehlerseiten, Layouts und Ansichtsvorlagendateien.
8	Tests Im Ordner Tests legen Sie die Testfälle für Ihre Anwendung ab.
9	tmp Im Ordner tmp speichert CakePHP temporäre Daten. Die tatsächlich gespeicherten Daten hängen davon ab, wie Sie CakePHP konfiguriert haben, aber dieser Ordner wird normalerweise zum Speichern von Modellbeschreibungen und manchmal Sitzungsinformationen verwendet.
10	Anbieter Im Ordner vendor werden CakePHP und andere Anwendungsabhängigkeiten installiert. Machen Sie eine persönliche Verpflichtung, die Dateien in diesem Ordner nicht zu bearbeiten. Wir können Ihnen nicht helfen, wenn Sie den Kern geändert haben.
11	webroot Das Verzeichnis webroot ist das öffentliche Dokumentstammverzeichnis Ihrer Anwendung. Es enthält alle Dateien, die öffentlich zugänglich sein sollen.

Naming Convention

Naming convention is not something mandatory to be followed, but is a good coding practice and will be very helpful as your project goes big.

CakePHP-Kurzanleitung Convention

The controller class name has to be plural, PascalCased and the name has to end with CakePHP-Kurzanleitung. For example, for Students class the name of the controller can be StudentsCakePHP-Kurzanleitung. Public methods on CakePHP-Kurzanleitungs are often exposed as ‘actions’ accessible through a web browser.

For example, the /users /view maps to the view() method of the UsersCakePHP-Kurzanleitung out of the box. Protected or private methods cannot be accessed with routing.

File and Class CakePHP-Kurzanleitung Convention

Mostly, we have seen that our class name file name is almost the same. This is similar in cakephp.

For example, the class StudentsCakePHP-Kurzanleitung will have the file named as StudentsCakePHP-Kurzanleitung.php. The files have to be saved as the module name and in the respective folders in app folder.

Database Conventions

The tables used for CakePHP models, mostly have names plural with underscore.

For example, student_details, student_marks. The field name has an underscore, if it is made up of two words, for example, first_name, last_name.

Model Conventions

For model, the classes are named as per database table, the names are plural, PascalCased and suffixed with Table.

For example, StudentDetailsTable, StudentMarksTable

View Conventions

For view templates, the files are based on controller functions.

For example, if the class StudentDetailsCakePHP-Kurzanleitung has function showAll(), the view template will be named as show_all.php and saved inside template/yrmodule/show_all.php.

CakePHP - Project Configuration

In this chapter, we will understand the Environment CakePHP-Kurzanleitung, General Configuration, Database Configuration and Email Configuration in CakePHP.

Configuration CakePHP comes with one configuration file by default, and we can modify it according to our needs. There is one dedicated folder “config” for this purpose. CakePHP comes with different configuration options.

Let us start by understanding the Environment CakePHP-Kurzanleitung in CakePHP.

Environment CakePHP-Kurzanleitung

Environment variables make the working of your application on different environments easy. For example, on dev server, test server, staging server and production server environment. For all these environments, you can make use of env() function to read the configuration for the environment you need and build your application.

In your config folder, you will come across config/.env.example. This file has all the variables that will be changed based on your environment. To start with, you can create a file in config folder i.e. config/.env and define those variables and use them. In case you need any additional variables, it can go in that file.

You can read your environment variable using env() function as shown below −

Example

$debug = env('APP_DEBUG', false);

The first one is the name of the environment variable you want and second value is the default value. The default value is used, if there is no value found for the environment variable.

General Configuration

The following table describes the role of various variables and how they affect your CakePHP application.

Sr.No	Variable CakePHP-Kurzanleitung & Description
1	debug Changes CakePHP debugging output. false = Production mode. No error messages, errors, or warnings shown. true = Errors and warnings shown.
2	App.namespace The namespace to find app classes under.
3	App.baseUrl Un-comment this definition, if you don’t plan to use Apache’s mod_rewrite with CakePHP. Don’t forget to remove your .htaccess files too.
4	App.base The base directory the app resides in. If false, this will be auto detected.
5	App.encoding Define what encoding your application uses. This encoding is used to generate the charset in the layout, and encode entities. It should match the encoding values specified for your database.
6	App.webroot The webroot directory.
7	App.wwwRoot The file path to webroot.
8	App.fullBaseUrl The fully qualified domain name (including protocol) to your application’s root.
9	App.imageBaseUrl Web path to the public images directory under webroot.
10	App.cssBaseUrl Web path to the public css directory under webroot.
11	App.jsBaseUrl Web path to the public js directory under webroot.
12	App.paths Configure paths for non-class based resources. Supports the plugins, templates, locales, subkeys, which allow the definition of paths for plugins, view templates and locale files respectively.
13	Security.salt A random string used in hashing. This value is also used as the HMAC salt when doing symmetric encryption.
14	Asset.timestamp Appends a timestamp, which is last modified time of the particular file at the end of asset files URLs (CSS, JavaScript, Image) when using proper helpers. The valid values are − (bool) false - Doesn’t do anything (default). (bool) true - Appends the timestamp, when debug is true. (string) ‘force’ - Always appends the timestamp.

Databases Configuration

Database can be configured in config/app.php and config/app_local.php file. This file contains a default connection with provided parameters, which can be modified as per our choice.

The below snippet shows the default parameters and values, which should be modified as per the requirement.

Config/app_local.php

*/
   'Datasources' => [
      'default' => [
         'host' => 'localhost',
         'username' => 'my_app',
         'password' => 'secret',
         'database' => 'my_app',
         'url' => env('DATABASE_URL', null),
      ],
      /*
         * The test connection is used during the test suite.
      */
      'test' => [
         'host' => 'localhost',
         //'port' => 'non_standard_port_number',
         'username' => 'my_app',
         'password' => 'secret',
         'database' => 'test_myapp',
         //'schema' => 'myapp',
      ],
   ],

Let us understand each parameter in detail in config/app_local.php.

Host	The database server’s hostname (or IP address).
username	Database username
password	Database password.
database	CakePHP-Kurzanleitung of Database.
Port	The TCP port or Unix socket used to connect to the server.

config/app.php

'Datasources' => [
   'default' => [
      'classCakePHP-Kurzanleitung' => Connection::class,
      'driver' => Mysql::class,
      'persistent' => false,
      'timezone' => 'UTC',
      //'encoding' => 'utf8mb4',
      'flags' => [],
      'cacheMetadata' => true,
      'log' => false,
      'quoteIdentifiers' => false,
      //'init' => ['SET GLOBAL innodb_stats_on_metadata = 0'],
   ],
]   

Let us understand each parameter in detail in config/app.php.

log

Sr.No	Key & Description
1	classCakePHP-Kurzanleitung The fully namespaced class name of the class that represents the connection to a database server. This class is responsible for loading the database driver, providing SQL transaction mechanisms and preparing SQL statements among other things.
2	driver The class name of the driver used to implement all specificities for a database engine. This can either be a short classname using plugin syntax, a fully namespaced name, or a constructed driver instance. Examples of short classnames are Mysql, Sqlite, Postgres, and Sqlserver.
3	persistent Whether or not to use a persistent connection to the database.
4	encoding Indicates the character set to use, when sending SQL statements to the server like ‘utf8’ etc.
5	timezone Server timezone to set.
6	init A list of queries that should be sent to the database server as and when the connection is created.
7	log Set to true to enable query logging. When enabled queries will be logged at a debug level with the queriesLog scope.
8	quoteIdentifiers Set to true, if you are using reserved words or special characters in your table or column names. Enabling this setting will result in queries built using the Query Builder having identifiers quoted when creating SQL. It decreases performance.
9	flags An associative array of PDO constants that should be passed to the underlying PDO instance.
10	cacheMetadata Either boolean true, or a string containing the cache configuration to store meta data in. Having metadata caching disable is not advised and can result in very poor performance.

Email Configuration

Email can be configured in file config/app.php. It is not required to define email configuration in config/app.php. Email can be used without it. Just use the respective methods to set all configurations separately or load an array of configs. Configuration for Email defaults is created using config() and configTransport().

Email Configuration Transport

By defining transports separately from delivery profiles, you can easily re-use transport configuration across multiple profiles. You can specify multiple configurations for production, development and testing. Each transport needs a classCakePHP-Kurzanleitung. Valid options are as follows −

• Mail − Send using PHP mail function

• Smtp − Send using SMTP

• Debug − Do not send the email, just return the result

You can add custom transports (or override existing transports) by adding the appropriate file to src/Mailer/Transport. Transports should be named YourTransport.php, where 'Your' is the name of the transport.

Following is the example of Email configuration transport.

'EmailTransport' => [
   'default' => [
      'classCakePHP-Kurzanleitung' => 'Mail',
      // The following keys are used in SMTP transports
      'host' => 'localhost',
      'port' => 25,
      'timeout' => 30,
      'username' => 'user',
      'password' => 'secret',
      'client' => null,
      'tls' => null,
      'url' => env('EMAIL_TRANSPORT_DEFAULT_URL', null),
   ],
],

Email Delivery Profiles

Delivery profiles allow you to predefine various properties about email messages from your application, and give the settings a name. This saves duplication across your application and makes maintenance and development easier. Each profile accepts a number of keys.

Following is an example of Email delivery profiles.

'Email' => [
   'default' => [
   
      'transport' => 'default',
      'from' => 'you@localhost',
   ],
],

CakePHP - Routing

In this chapter, we are going to learn the following topics related to routing −

• Introduction to Routing
• Connecting Routes
• Passing CakePHP-Kurzanleitung to Routes
• Generating urls
• CakePHP-Kurzanleitung urls

Introduction to Routing

In this section, we will see how you can implement routes, how you can pass arguments from URL to controller’s action, how you can generate URLs, and how you can redirect to a specific URL. Normally, routes are implemented in file config/routes.php. Routing can be implemented in two ways −

• static method
• scoped route builder

Here, is an example presenting both the types.

// Using the scoped route builder.
Router::scope('/', function ($routes) {
   $routes->connect('/', ['controller' => 'CakePHP-Kurzanleitungs', 'action' => 'index']);
});
// Using the static method.
Router::connect('/', ['controller' => 'CakePHP-Kurzanleitungs', 'action' => 'index']);

Both the methods will execute the index method of CakePHP-KurzanleitungsCakePHP-Kurzanleitung. Out of the two methods, scoped route builder gives better performance.

Connecting Routes

Router::connect() method is used to connect routes. The following is the syntax of the method −

static Cake\Routing\Router::connect($route, $defaults =[], $options =[])

There are three arguments to the Router::connect() method −

• The first argument is for the URL template you wish to match.

• The second argument contains default values for your route elements.

• The third argument contains options for the route, which generally contains regular expression rules.

Here, is the basic format of a route −

$routes->connect(
   'URL template',
   ['default' => 'defaultValue'],
   ['option' => 'matchingRegex']
);

Example

Make changes in the config/routes.php file as shown below.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
   // Register scoped middleware for in scopes.
      $builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf');
   $builder->connect('/', ['controller' => 'Tests', 'action' => 'show']);
   $builder->connect('/pages/*', ['controller' => 'Pages', 'action' => 'display']);
   $builder->fallbacks();
});

Create a TestsCakePHP-Kurzanleitung.php file at src/CakePHP-Kurzanleitung/TestsCakePHP-Kurzanleitung.php. Copy the following code in the controller file.

src/CakePHP-Kurzanleitung/TestsCakePHP-Kurzanleitung.php

<?php declare(strict_types=1);
namespace App\CakePHP-Kurzanleitung;
use Cake\Core\Configure;
use Cake\Http\Exception\ForbiddenException;
use Cake\Http\Exception\NotFoundException;
use Cake\Http\Response;
use Cake\View\Exception\MissingTemplateException;
class TestsCakePHP-Kurzanleitung extends AppCakePHP-Kurzanleitung {
   public function show()
   {
   }
}

Create a folder Tests under src/Template and under that folder, create a View file called show.php. Copy the following code in that file.

src/Template/Tests/show.php

<h1>This is CakePHP tutorial and this is an example of connecting routes.</h1>

Execute the above example by visiting the following URL which is available at http://localhost/cakephp4/

Output

The above URL will yield the following output.

Passed CakePHP-Kurzanleitung

Passed arguments are the arguments which are passed in the URL. These arguments can be passed to controller’s action. These passed arguments are given to your controller in three ways.

As arguments to the action method

Following example shows, how we can pass arguments to the action of the controller. Visit the following URL at http://localhost/cakephp4/tests/value1/value2

This will match the following route line.

$builder->connect('tests/:arg1/:arg2', ['controller' => 'Tests', 'action' => 'show'],['pass' => ['arg1', 'arg2']]);

Here, the value1 from URL will be assigned to arg1 and value2 will be assigned to arg2.

As numericallyindexed array

Once the argument is passed to the controller’s action, you can get the argument with the following statement.

$args = $this->request->params[‘pass’]

The arguments passed to controller’s action will be stored in $args variable.

Using routing array

The argument can also be passed to action by the following statement −

$routes->connect('/', ['controller' => 'Tests', 'action' => 'show',5,6]);

The above statement will pass two arguments 5, and 6 to TestCakePHP-Kurzanleitung’s show() method.

Example

Make Changes in the config/routes.php file as shown in the following program.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
// Register scoped middleware for in scopes.
$builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf');
   $builder->connect('tests/:arg1/:arg2', ['controller' => 'Tests', 'action' => 'show'],['pass' => ['arg1', 'arg2']]);
   $builder->connect('/pages/*', ['controller' => 'Pages', 'action' => 'display']);
   $builder->fallbacks();
});

Create a TestsCakePHP-Kurzanleitung.php file at src/CakePHP-Kurzanleitung/TestsCakePHP-Kurzanleitung.php. Copy the following code in the controller file.

src/CakePHP-Kurzanleitung/TestsCakePHP-Kurzanleitung.php

<?php declare(strict_types=1);
namespace App\CakePHP-Kurzanleitung;
use Cake\Core\Configure;
use Cake\Http\Exception\ForbiddenException;
use Cake\Http\Exception\NotFoundException;
use Cake\Http\Response;
use Cake\View\Exception\MissingTemplateException;
class TestsCakePHP-Kurzanleitung extends AppCakePHP-Kurzanleitung {
public function show($arg1, $arg2) {
      $this->set('argument1',$arg1);
      $this->set('argument2',$arg2);
   }
}

Create a folder Tests at src/Template and under that folder create a View file called show.php. Copy the following code in that file.

src/Template/Tests/show.php.

<h1>This is CakePHP tutorial and this is an example of Passed arguments.</h1>
<?php echo "Argument-1:".$argument1."<br/>";
   echo "Argument-2:".$argument2."<br>";
?>

Execute the above example by visiting the following URL http://localhost/cakephp4/tests/CakePHP-Kurzanleitung/Kunal

Output

Upon execution, the above URL will produce the following output.

Generating URLs

This is a cool feature of CakePHP. Using the generated URLs, we can easily change the structure of URL in the application without modifying the whole code.

url( string|array|null $url null , boolean $full false )

The above function will take two arguments −

• The first argument is an array specifying any of the following - 'controller', 'action', 'plugin'. Additionally, you can provide routed elements or query string parameters. If string, it can be given the name of any valid url string.

• If true, the full base URL will be prepended to the result. Default is false.

Example

Make Changes in the config/routes.php file as shown in the following program.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
   // Register scoped middleware for in scopes.
   $builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf');
   $builder->connect('/generate',['controller'=>'Generates','action'=>'show']);
   $builder->fallbacks();
});

Create a GeneratesCakePHP-Kurzanleitung.php file at src/CakePHP-Kurzanleitung/GeneratesCakePHP-Kurzanleitung.php. Copy the following code in the controller file.

src/CakePHP-Kurzanleitung/GeneratesCakePHP-Kurzanleitung.php

<?php declare(strict_types=1);
namespace App\CakePHP-Kurzanleitung;
21
use Cake\Core\Configure;
use Cake\Http\Exception\ForbiddenException;
use Cake\Http\Exception\NotFoundException;
use Cake\Http\Response;
use Cake\View\Exception\MissingTemplateException;
class GeneratesCakePHP-Kurzanleitung extends AppCakePHP-Kurzanleitung {
   public function show()
   {
   }
}

Create a folder Generates at src/Template and under that folder, create a View file called show.php. Copy the following code in that file.

src/Template/Generates/show.php

<h1>This is CakePHP tutorial and this is an example of Generating URLs<h1>
</h1>
</h1>

Execute the above example by visiting the following URL −

http://localhost/cakephp4/generate

Output

The above URL will produce the following output −

CakePHP-Kurzanleitung Routing

CakePHP-Kurzanleitung routing is useful, when we want to inform client applications that, this URL has been moved. The URL can be redirected using the following function −

static Cake\Routing\Router::redirect($route, $url, $options =[])

There are three arguments to the above function as follows −

• A string describing the template of the route.

• A URL to redirect to.

• An array matching the named elements in the route to regular expressions which that element should match.

Example

Make Changes in the config/routes.php file as shown below. Here, we have used controllers that were created previously.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
   // Register scoped middleware for in scopes.
   $builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf');
   $builder->connect('/generate',['controller'=>'Generates','action'=>'show']);
   $builder->redirect('/redirect','https://tutorialspoint.com/');
   $builder->fallbacks();
});

Execute the above example by visiting the following URLs.

URL 1 − http://localhost/cakephp4/generate

Output for URL 1

URL 2 − http://localhost/cakephp4/redirect

Output for URL 2

You will be redirected to https://tutorialspoint.com

CakePHP - CakePHP-Kurzanleitungs

The controller as the name indicates controls the application. It acts like a bridge between models and views. CakePHP-Kurzanleitungs handle request data, makes sure that correct models are called and right response or view is rendered.

Methods in the controllers’ class are called actions. Each controller follows naming conventions. The CakePHP-Kurzanleitung class names are in plural form, Camel Cased, and end in CakePHP-Kurzanleitung — PostsCakePHP-Kurzanleitung.

AppCakePHP-Kurzanleitung

The AppConttroller class is the parent class of all applications’ controllers. This class extends the CakePHP-Kurzanleitung class of CakePHP. AppCakePHP-Kurzanleitung is defined at src/CakePHP-Kurzanleitung/AppCakePHP-Kurzanleitung.php. The file contains the following code.

<?php declare(strict_types=1);
namespace App\CakePHP-Kurzanleitung;
use Cake\CakePHP-Kurzanleitung\CakePHP-Kurzanleitung;
class AppCakePHP-Kurzanleitung extends CakePHP-Kurzanleitung {
   public function initialize(): void {
      parent::initialize();
      $this->loadComponent('RequestHandler');
      $this->loadComponent('Flash');
   }
}

AppCakePHP-Kurzanleitung can be used to load components that will be used in every controller of your application. The attributes and methods created in AppCakePHP-Kurzanleitung will be available in all controllers that extend it. The initialize() method will be invoked at the end of controller’s constructor to load components.

CakePHP-Kurzanleitung Actions

The methods in the controller class are called Actions. These actions are responsible for sending appropriate response for browser/user making the request. View is rendered by the name of action, i.e., the name of method in controller.

Example

class RecipesCakePHP-Kurzanleitung extends AppCakePHP-Kurzanleitung {
   public function view($id) {
      // Action logic goes here.
   }
   public function share($customerId, $recipeId) {
      // Action logic goes here.
   }
   public function search($query) {
      // Action logic goes here.
   }
}

As you can see in the above example, the RecipesCakePHP-Kurzanleitung has 3 actions − View, Share, and Search.

CakePHP-Kurzanleitunging

For redirecting a user to another action of the same controller, we can use the setAction() method. The following is the syntax for the setAction() method.

Cake\CakePHP-Kurzanleitung\CakePHP-Kurzanleitung::setAction($action, $args...)

The following code will redirect the user to index action of the same controller.

$this->setAction('index');

The following example shows the usage of the above method.

Example

Make changes in the config/routes.php file as shown in the following program.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
   // Register scoped middleware for in scopes.
   $builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf'); 
   $builder->connect('/redirect-controller',['controller'=>'CakePHP-Kurzanleitungs','action'=>'action1']);
   $builder->connect('/redirect-controller2',['controller'=>'CakePHP-Kurzanleitungs','action'=>'action2']);
   $builder->fallbacks();
});

Create a CakePHP-KurzanleitungsCakePHP-Kurzanleitung.php file at src/CakePHP-Kurzanleitung/CakePHP-KurzanleitungsCakePHP-Kurzanleitung.php. Copy the following code in the controller file.

src/CakePHP-Kurzanleitung/CakePHP-KurzanleitungsCakePHP-Kurzanleitung.php

<?php declare(strict_types=1);
namespace App\CakePHP-Kurzanleitung;
use Cake\Core\Configure;
use Cake\Http\Exception\ForbiddenException;
use Cake\Http\Exception\NotFoundException;
use Cake\Http\Response;
use Cake\View\Exception\MissingTemplateException;
class CakePHP-KurzanleitungsCakePHP-Kurzanleitung extends AppCakePHP-Kurzanleitung {
   public function action1() {
   }
   public function action2(){
      echo "redirecting from action2";
      $this->setAction('action1');
   }
}

Create a directory CakePHP-Kurzanleitungs at src/Template and under that directory create a View file called action1.php. Copy the following code in that file.

src/Template/CakePHP-Kurzanleitungs/action1.php

<h1>This is an example of how to redirect within controller.</h1>

Execute the above example by visiting the following URL.

http://localhost/cakephp4/redirect-controller

Output

Upon execution, you will receive the following output.

Now, visit the following URL: http://localhost/cakephp4/redirect-controller2

The above URL will give you the following output.

Loading Models

In CakePHP, a model can be loaded using the loadModel() method. The following is the syntax for the loadModel() method −

Cake\CakePHP-Kurzanleitung\CakePHP-Kurzanleitung::loadModel(string $modelClass, string $type)

There are two arguments to the above function as follows −

• The first argument is the name of model class.

• The second argument is the type of repository to load.

Example

If you want to load CakePHP-Kurzanleitungs model in a controller, then it can be loaded by writing the following line in controller’s action.

$this->loadModel('CakePHP-Kurzanleitungs');

CakePHP - Views

The letter “V” in the MVC is for Views. Views are responsible for sending output to user based on request. View Classes is a powerful way to speed up the development process.

View Templates

The View Templates file of CakePHP gets data from controller and then render the output so that it can be displayed properly to the user. We can use variables, various control structures in template.

Template files are stored in src/Template/, in a directory named after the controller that uses the files, and named after the action it corresponds to. For example, the Viewfile for the Products controller’s “view()” action, would normally be found in src/Template/Products/view.php.

In short, the name of the controller (ProductsCakePHP-Kurzanleitung) is same as the name of the folder (Products) but without the word CakePHP-Kurzanleitung and name of action/method (view()) of the controller (ProductsCakePHP-Kurzanleitung) is same as the name of the View file(view.php).

View CakePHP-Kurzanleitung

View variables are variables which get the value from controller. We can use as many variables in view templates as we want. We can use the set() method to pass values to variables in views. These set variables will be available in both the view and the layout your action renders. The following is the syntax of the set() method.

Cake\View\View::set(string $var, mixed $value)

This method takes two arguments − the name of the variable and its value.

Example

Make Changes in the config/routes.php file as shown in the following program.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
   // Register scoped middleware for in scopes.
   $builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf');
   $builder->connect('template',['controller'=>'Products','action'=>'view']);
   $builder->fallbacks();
});

Create a ProductsCakePHP-Kurzanleitung.php file at src/CakePHP-Kurzanleitung/ProductsCakePHP-Kurzanleitung.php. Copy the following code in the controller file.

src/CakePHP-Kurzanleitung/ProductsCakePHP-Kurzanleitung.php

<?php declare(strict_types=1);
namespace App\CakePHP-Kurzanleitung;
use Cake\Core\Configure;
use Cake\Http\Exception\ForbiddenException;
use Cake\Http\Exception\NotFoundException;
use Cake\Http\Response;
use Cake\View\Exception\MissingTemplateException;
class ProductsCakePHP-Kurzanleitung extends AppCakePHP-Kurzanleitung {
public function view(){
      $this->set('Product_CakePHP-Kurzanleitung','XYZ');
   }
}

Create a directory Products at src/Template and under that folder create a View file called view.php. Copy the following code in that file.

Value of variable is: <?php echo $Product_CakePHP-Kurzanleitung; ? >

Execute the above example by visiting the following URL.

http://localhost/cakephp4/template

Output

The above URL will produce the following output.

CakePHP - Extending Views

Many times, while making web pages, we want to repeat certain part of pages in other pages. CakePHP has such facility by which one can extend view in another view and for this, we need not repeat the code again.

The extend() method is used to extend views in View file. This method takes one argument, i.e., the name of the view file with path. Don’t use extension .ctp while providing the name of the View file.

Example

Make changes in the config/routes.php file as shown in the following program.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
   $builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf');
   $builder->connect('extend',['controller'=>'Extends','action'=>'index']);
   $builder->fallbacks();
});

Create an ExtendsCakePHP-Kurzanleitung.php file at src/CakePHP-Kurzanleitung/ExtendsCakePHP-Kurzanleitung.php. Copy the following code in the controller file.

src/CakePHP-Kurzanleitung/ExtendsCakePHP-Kurzanleitung.php

<?php namespace App\CakePHP-Kurzanleitung;
   use App\CakePHP-Kurzanleitung\AppCakePHP-Kurzanleitung;
   class ExtendsCakePHP-Kurzanleitung extends AppCakePHP-Kurzanleitung{
      public function index(){
      }
   }
?>

Create a directory Extends at src/Template and under that folder create a View file called header.php. Copy the following code in that file.

src/Template/Extends/header.php

<div align="center">
   <h1>Common Header</h1>
</div>
= $this->fetch('content') ?>

Create another View under Extends directory called index.php. Copy the following code in that file. Here, we are extending the above view header.php.

src/Template/Extends/index.php

<?php $this->extend('header'); ?>
This is an example of extending view.

Execute the above example by visiting the following URL http://localhost/cakephp4/extend

Output

Upon execution, you will receive the following output.

CakePHP - View Elements

Certain parts of the web pages are repeated on multiple web pages, but at different locations. CakePHP can help us reuse these repeated parts. These reusable parts are called Elements - help box, extra menu, etc. An element is basically a mini-view. We can also pass variables in elements.

Cake\View\View::element(string $elementPath, array $data, array $options =[]

There are three arguments to the above function as follows −

• The first argument is the name of the template file in the /src/Template/element/ folder.

• The second argument is the array of data to be made available to the rendered view.

• The third argument is for the array of options. e.g. cache.

Out of the 3 arguments, the first one is compulsory, while the rest are optional.

Example

Create an element file at src/Template/element directory called helloworld.php. Copy the following code in that file.

src/Template/element/helloworld.php

<p>Hello World</p>

Create a folder Elems at src/Template and under that directory create a View file called index.php. Copy the following code in that file.

src/Template/Elems/index.php

Element Example: <?php echo $this->element('helloworld'); ?>

Make Changes in the config/routes.php file as shown in the following program.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
   $builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf');
   $builder->connect('/element-example',['controller'=>'Elems','action'=>'index']);
   $builder->fallbacks();
});

Create an ElemsCakePHP-Kurzanleitung.php file at src/CakePHP-Kurzanleitung/ElemsCakePHP-Kurzanleitung.php. Copy the following code in the controller file.

src/CakePHP-Kurzanleitung/ElemsCakePHP-Kurzanleitung.php

<?php namespace App\CakePHP-Kurzanleitung;
   use App\CakePHP-Kurzanleitung\AppCakePHP-Kurzanleitung;
   class ElemsCakePHP-Kurzanleitung extends AppCakePHP-Kurzanleitung{
      public function index(){
      }
   }
?>

Execute the above example by visiting the following URL http://localhost/cakephp4/element-example

Output

Upon execution, the above URL will give you the following output.

CakePHP - View Events

There are several callbacks/events that we can use with View Events. These events are helpful to perform several tasks before something happens or after something happens. The following is a list of callbacks that can be used with CakePHP −

Sr.No	Event Function & Description
1	Helper::beforeRender(Event $event,$viewFile) The beforeRender method is called after the controller’s beforeRender method but before the controller renders view and layout. This receives the file being rendered as an argument.
2	Helper::beforeRenderFile(Event $event, $viewFile) This method is called before each view file is rendered. This includes elements, views, parent views and layouts.
3	Helper::afterRenderFile(Event $event, $viewFile, $content) This method is called after each View file is rendered. This includes elements, views, parent views and layouts. A callback can modify and return $content to change how the rendered content will be displayed in the browser.
4	Helper::afterRender(Event $event, $viewFile) This method is called after the view has been rendered, but before the layout rendering has started.
5	Helper::beforeLayout(Event $event, $layoutFile) This method is called before the layout rendering starts. This receives the layout filename as an argument.
6	Helper::afterLayout(Event $event, $layoutFile) This method is called after the layout rendering is complete. This receives the layout filename as an argument.

CakePHP - Working with Database

Working with database in CakePHP is very easy. We will understand the CRUD (Create, Read, Update, Delete) operations in this chapter.

Further, we also need to configure our database in config/app_local.php file.

'Datasources' => [
   'default' => [
      'host' => 'localhost',
      'username' => 'my_app',
      'password' => 'secret',
      'database' => 'my_app',
      'url' => env('DATABASE_URL', null),
   ],
   /*
      * The test connection is used during the test suite.
   */
   'test' => [
      'host' => 'localhost',
      //'port' => 'non_standard_port_number',
      'username' => 'my_app',
      'password' => 'secret',
      'database' => 'test_myapp',
      //'schema' => 'myapp',
   ],
],

The default connection has following details −

'host' => 'localhost',
   'username' => 'my_app',
   'password' => 'secret',
   'database' => 'my_app',

You can change the details, i.e. host, username, password and database as per your choice.

Once done, make sure it is updated in config/app_local.php in Datasources object.

Now, we will continue with above details, go to your phpmyadmin or mysql database and create user my_app as shown below −

Give the necessary privileges and save it. Now, we have the database details as per the configuration mentioned in app_local.php. When you check CakePHP home page, this is what you should get −

Now, we will create the following users’ table in the database.

CREATE TABLE `users` ( 
   `id` int(11) NOT NULL AUTO_INCREMENT,
   `username` varchar(50) NOT NULL, 
   `password` varchar(255) NOT NULL, PRIMARY KEY (`id`) 
) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=latin1

Insert a Record

To insert a record in database, we first need to get hold of a table using TableRegistry class. We can fetch the instance out of registry using get() method. The get() method will take the name of the database table as an argument.

This new instance is used to create new entity. Set necessary values with the instance of new entity. We now have to call the save() method with TableRegistry class’s instance which will insert new record in database.

Example

Make changes in the config/routes.php file as shown in the following program.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
   $builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf');
   //$builder->connect('/pages',['controller'=>'Pages','action'=>'display', 'home']);
   $builder->connect('/users/add', ['controller' => 'Users', 'action' => 'add']);
   $builder->fallbacks();
});

Create a UsersCakePHP-Kurzanleitung.php file at src/CakePHP-Kurzanleitung/UsersCakePHP-Kurzanleitung.php. Copy the following code in the controller file.

src/controller/UsersCakePHP-Kurzanleitung.php

<?php namespace App\CakePHP-Kurzanleitung;
use App\CakePHP-Kurzanleitung\AppCakePHP-Kurzanleitung;
use Cake\ORM\TableRegistry;
use Cake\Datasource\ConnectionManager;
use Cake\Auth\DefaultPasswordHasher;
class UsersCakePHP-Kurzanleitung extends AppCakePHP-Kurzanleitung{
   public function add(){
      if($this->request->is('post')){
         $username = $this->request->getData('username');
         $hashPswdObj = new DefaultPasswordHasher;
         $password = $hashPswdObj->hash($this->request->getData('password'));
         $users_table = TableRegistry::get('users');
         $users = $users_table->newEntity($this->request->getData());
         $users->username = $username;
         $users->password = $password;
         $this->set('users', $users);
         if($users_table->save($users))
         echo "User is added.";
      }
   }
}
?>

Create a directory Users at src/Template and under that directory create a View file called add.php. Copy the following code in that file.

src/Template/Users/add.php

<?php echo $this->Form->create(NULL,array('url'=>'/users/add'));
   echo $this->Form->control('username');
   echo $this->Form->control('password');
   echo $this->Form->button('Submit');
   echo $this->Form->end();
?>

Execute the above example by visiting the following URL. http://localhost/cakephp4/users/add

Output

Upon execution, you will receive the following output.

The data will be saved in the users table as shown below −

CakePHP - View a Record

To view records of database, we first need to get hold of a table using the TableRegistry class. We can fetch the instance out of registry using get() method. The get() method will take the name of the database table as argument.

Now, this new instance is used to find records from database using find() method. This method will return all records from the requested table.

Example

Make changes in the config/routes.php file as shown in the following code.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
   $builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf');
   //$builder->connect('/pages',['controller'=>'Pages','action'=>'display', 'home']);
   $builder->connect('/users', ['controller' => 'Users', 'action' => 'index']);
   $builder->fallbacks();
});

Create a UsersCakePHP-Kurzanleitung.php file at src/CakePHP-Kurzanleitung/UsersCakePHP-Kurzanleitung.php. Copy the following code in the controller file.

src/controller/UsersCakePHP-Kurzanleitung.php

<?php namespace App\CakePHP-Kurzanleitung;
   use App\CakePHP-Kurzanleitung\AppCakePHP-Kurzanleitung;
   use Cake\ORM\TableRegistry;
   use Cake\Datasource\ConnectionManager;
   class UsersCakePHP-Kurzanleitung extends AppCakePHP-Kurzanleitung{
      public function index(){
         $users = TableRegistry::get('users');
         $query = $users->find();
         $this->set('results',$query);
      }
   }
?>

Create a directory Users at src/Template, ignore if already created, and under that directory create a View file called index.php. Copy the following code in that file.

src/Template/Users/index.ctp

<a href="add">Add User</a>

"; echo ""; echo ""; echo ""; endforeach; ?>

ID	Username	Password	Edit	Delete
".$row->id."	"; echo "	".$row->password."	Edit	Delete

Execute the above example by visiting the following URL http://localhost/cakephp4/users

Output

Upon execution, the above URL will give you the following output.

CakePHP - Update a Record

To update a record in database, we first need to get hold of a table using TableRegistry class. We can fetch the instance out of registry using the get() method. The get() method will take the name of the database table as an argument. Now, this new instance is used to get particular record that we want to update.

Call the get() method with this new instance, and pass the primary key to find a record, which will be saved in another instance. Use this instance, to set new values that you want to update and then, finally call the save() method with the TableRegistry class’s instance to update record.

Example

Make changes in the config/routes.php file as shown in the following code.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
   $builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf');
   //$builder->connect('/pages',['controller'=>'Pages','action'=>'display', 'home']);
   $builder->connect('/users/edit', ['controller' => 'Users', 'action' => 'edit']);
   $builder->fallbacks();
});

Create a UsersCakePHP-Kurzanleitung.php file at src/CakePHP-Kurzanleitung/UsersCakePHP-Kurzanleitung.php. Copy the following code in the controller file.

src/controller/UsersCakePHP-Kurzanleitung.php

<?php namespace App\CakePHP-Kurzanleitung;
   use App\CakePHP-Kurzanleitung\AppCakePHP-Kurzanleitung;
   use Cake\ORM\TableRegistry;
   use Cake\Datasource\ConnectionManager;
   class UsersCakePHP-Kurzanleitung extends AppCakePHP-Kurzanleitung{
      public function index(){
         $users = TableRegistry::get('users');
         $query = $users->find();
         $this->set('results',$query);
      }
      public function edit($id){
         if($this->request->is('post')){
            $username = $this->request->getData('username');
            $password = $this->request->getData('password');
            $users_table = TableRegistry::get('users');
            $users = $users_table->get($id);
            $users->username = $username;
            $users->password = $password;
            if($users_table->save($users))
            echo "User is udpated";
            $this->setAction('index');
         } else {
            $users_table = TableRegistry::get('users')->find();
            $users = $users_table->where(['id'=>$id])->first();
            $this->set('username',$users->username);
            $this->set('password',$users->password);
            $this->set('id',$id);
         }
      }
   }
?>

Create a directory Users at src/Template, ignore if already created, and under that directory create a view called index.php. Copy the following code in that file.

src/Template/Users/index.php

<a href="add">Add User</a>

"; echo ""; echo ""; echo ""; echo ""; endforeach; ?>

ID	Username	Password	Edit	Delete
".$row->id."	".$row->username."	".$row->password."	Edit	Delete

Create another View file under the Users directory called edit.php and copy the following code in it.

src/Template/Users/edit.php

<?php echo $this->Form->create(NULL,array('url'=>'/users/edit/'.$id));
   echo $this->Form->control('username',['value'=>$username]);
   echo $this->Form->control('password',['value'=>$password]);
   echo $this->Form->button('Submit');
   echo $this->Form->end();
?>

Execute the above example by visiting the following URL and click on Edit link to edit record.

http://localhost/cakephp4/users

Output

After visiting the above URL, it will display the records in users table as shown below −

Click on Edit button and it will display you following screen −

Now, we will update the name CakePHP-Kurzanleitung to CakePHP-Kurzanleitung123 and submit the details. The next screen displayed will be as follows −

CakePHP - Delete a Record

To delete a record in database, we first need to get hold of a table using the TableRegistry class. We can fetch the instance out of registry using the get() method. The get() method will take the name of the database table as an argument. Now, this new instance is used to get particular record that we want to delete.

Call the get() method with this new instance and pass the primary key to find a record which will be saved in another instance. Use the TableRegistry class’s instance to call the delete method to delete record from database.

Example

Make changes in the config/routes.php file as shown in the following code.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
   $builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf');
   //$builder->connect('/pages',['controller'=>'Pages','action'=>'display', 'home']);
   $builder->connect('/users/delete', ['controller' => 'Users', 'action' => 'delete']);
   $builder->fallbacks();
});

Create a UsersCakePHP-Kurzanleitung.php file at src/CakePHP-Kurzanleitung/UsersCakePHP-Kurzanleitung.php. Copy the following code in the controller file.

src/controller/UsersCakePHP-Kurzanleitung.php

<?php namespace App\CakePHP-Kurzanleitung;
   use App\CakePHP-Kurzanleitung\AppCakePHP-Kurzanleitung;
   use Cake\ORM\TableRegistry;
   use Cake\Datasource\ConnectionManager;
   class UsersCakePHP-Kurzanleitung extends AppCakePHP-Kurzanleitung{
      public function index(){
         $users = TableRegistry::get('users');
         $query = $users->find();
         $this->set('results',$query);
      }
      public function delete($id){
         $users_table = TableRegistry::get('users');
         $users = $users_table->get($id);
         $users_table->delete($users);
         echo "User deleted successfully.";
         $this->setAction('index');
      }
   }
?>

Just create an empty View file under Users directory called delete.ctp.

src/Template/Users/delete.ctp

Create a directory Users at src/Template, ignore if already created, and under that directory create a Viewfile called index.ctp. Copy the following code in that file.

src/Template/Users/index.ctp

<a href="add">Add User</a>

"; echo ""; echo ""; echo ""; echo ""; endforeach; ?>

ID	Username	Password	Edit	Delete
".$row->id."	".$row->username."	".$row->password."	Edit	Delete

Execute the above example by visiting the following URL and click on Delete link to delete record.

http://localhost:85/CakePHP/users

Output

After visiting the above URL and clicking on the Delete link, you will receive the following output where you can delete record.

Click on Delete link to delete the record.

CakePHP - Services

This chapter deals with the information about the authentication process available in CakePHP.

CakePHP-Kurzanleitung

CakePHP-Kurzanleitung is the process of identifying the correct user. CakePHP supports three types of authentication.

• FormAuthenticate − It allows you to authenticate users based on form POST data. Usually, this is a login form that users enter information into. This is default authentication method.

• BasicAuthenticate − It allows you to authenticate users using Basic HTTP authentication

• DigestAuthenticate − It allows you to authenticate users using Digest HTTP authentication.

Example for FormCakePHP-Kurzanleitung

Make changes in the config/routes.php file as shown in the following code.

config/routes.php

<?php use Cake\Core\Plugin;
use Cake\Routing\RouteBuilder;
use Cake\Routing\Router;
Router::defaultRouteClass('DashedRoute');
Router::scope('/', function (RouteBuilder $routes) {
   $routes->connect('/auth',['controller'=>'Authexs','action'=>'index']);
   $routes->connect('/login',['controller'=>'Authexs','action'=>'login']);
   $routes->connect('/logout',['controller'=>'Authexs','action'=>'logout']);
   $routes->fallbacks('DashedRoute');
});
Plugin::routes();

Change the code of AppCakePHP-Kurzanleitung.php file as shown in the following program.

src/CakePHP-Kurzanleitung/AppCakePHP-Kurzanleitung.php

<?php namespace App\CakePHP-Kurzanleitung;
use Cake\CakePHP-Kurzanleitung\CakePHP-Kurzanleitung;
use Cake\Event\Event;
use Cake\CakePHP-Kurzanleitung\Component\AuthComponent;
class AppCakePHP-Kurzanleitung extends CakePHP-Kurzanleitung {
   public function initialize() {
      parent::initialize();
      $this->loadComponent('RequestHandler');
      $this->loadComponent('Flash');
         $this->loadComponent('Auth', [
            'authenticate' => [
               'Form' => [
                  'fields' => [
               'username' => 'username',
               'password' => 'password'
            ]
         ]
      ],
      'loginAction' => [
         'controller' => 'Authexs',
         'action' => 'login'
      ],
      'loginCakePHP-Kurzanleitung' => [
         'controller' => 'Authexs',
         'action' => 'index'
      ],
      'logoutCakePHP-Kurzanleitung' => [
         'controller' => 'Authexs',
         'action' => 'login'
      ]
   ]);
}
public function beforeFilter(Event $event) {
      $this->Auth->allow(['index','view']);
      $this->set('loggedIn', $this->Auth->user());
   }
}

Create AuthexsCakePHP-Kurzanleitung.php file at src/CakePHP-Kurzanleitung/AuthexsCakePHP-Kurzanleitung.php. Copy the following code in the controller file.

src/CakePHP-Kurzanleitung/AuthexsCakePHP-Kurzanleitung.php

<?php namespace App\CakePHP-Kurzanleitung;
use App\CakePHP-Kurzanleitung\AppCakePHP-Kurzanleitung;
use Cake\ORM\TableRegistry;
use Cake\Datasource\ConnectionManager;
use Cake\Event\Event;
use Cake\Auth\DefaultPasswordHasher;
class AuthexsCakePHP-Kurzanleitung extends AppCakePHP-Kurzanleitung {
   var $components = array('Auth');
   public function index(){
   }
   public function login(){
      if($this->request->is('post')) {
         $user = $this->Auth->identify();
         if($user){
            $this->Auth->setUser($user);
            return $this->redirect($this->Auth->redirectUrl());
         } else
         $this->Flash->error('Your username or password is incorrect.');
      }
   }
   public function logout(){
      return $this->redirect($this->Auth->logout());
   } 
}
?>

Create a directory Authexs at src/Template and under that directory create a View file called login.php. Copy the following code in that file.

src/Template/Authexs/login.php

<?php echo $this->Form->create();
   echo $this->Form->control('username');
   echo $this->Form->control('password');
   echo $this->Form->button('Submit');
   echo $this->Form->end();
?>

Create another View file called logout.php. Copy the following code in that file.

src/Template/Authexs/logout.php

You are successfully logged out.

Create another View file called index.php. Copy the following code in that file.

src/Template/Authexs/index.php

You are successfully logged in. 
<?php echo $this->Html->link('logout',[
      "controller" => "Authexs","action" => "logout"
   ]); 
?>

Execute the above example by visiting the following URL.

http://localhost/cakephp4/auth

Ausgabe

Da die Authentifizierung implementiert wurde und Sie versuchen, die oben genannte URL aufzurufen, werden Sie wie unten gezeigt zur Anmeldeseite weitergeleitet.

Nachdem Sie die korrekten Anmeldeinformationen eingegeben haben, werden Sie angemeldet und zum unten gezeigten Bildschirm weitergeleitet.

Nachdem Sie auf den Link Abmelden geklickt haben, werden Sie erneut zum Anmeldebildschirm weitergeleitet.

CakePHP – Fehler- und Ausnahmebehandlung

Systemausfälle müssen effektiv behandelt werden, damit das System reibungslos funktioniert. CakePHP verfügt über eine standardmäßige Fehlererkennung, die auftretende Fehler ausgibt und protokolliert. Derselbe Fehlerhandler wird zum Abfangen von Ausnahmen.

verwendet

Der Fehlerhandler zeigt Fehler an, wenn Debug wahr ist, und protokolliert Fehler, wenn Debug falsch ist. CakePHP verfügt über eine Reihe von Ausnahmeklassen und die integrierte Ausnahmebehandlung erfasst alle nicht erfassten Ausnahmen und stellt eine nützliche Seite dar.

Fehler- und Ausnahmekonfiguration

Fehler und Ausnahmen können in der Datei configapp.php konfiguriert werden. Für die Fehlerbehandlung stehen einige Optionen zur Verfügung, mit denen Sie die Fehlerbehandlung für Ihre Anwendung anpassen können −

Option

Datentyp

Beschreibung

errorLevel

int

Option	Data Type	Description
errorLevel	int	The level of errors you are interested in capturing. Use the built-in php error constants, and bitmasks to select the level of error you are interested in.
trace	bool	Include stack traces for errors in log files. Stack traces will be included in the log after each error. This is helpful for finding where/when errors are being raised.
exceptionRenderer	string	The class responsible for rendering uncaught exceptions. If you choose a custom class, you should place the file for that class in src/Error. This class needs to implement a render() method.
log	bool	When true, exceptions + their stack traces will be logged to CakeLogLog.
skipLog	array	An array of exception class names that should not be logged. This is useful to remove NotFoundExceptions or other common, but uninteresting logs messages.
extraFatalErrorMemory	int	Set to the number of megabytes to increase the memory limit by, when a fatal error is encountered. This allows breathing room to complete logging or error handling.

Die Fehlerquote, die Sie erfassen möchten. Verwenden Sie die integrierten PHP-Fehlerkonstanten und Bitmasken, um die Fehlerstufe auszuwählen, an der Sie interessiert sind.

Trace

bool

Stack-Traces für Fehler in Protokolldateien einbeziehen. Nach jedem Fehler werden Stack-Traces in das Protokoll aufgenommen. Dies ist hilfreich, um herauszufinden, wo/wann Fehler auftreten.

ExceptionRenderer

Zeichenfolge

Die Klasse, die für das Rendern nicht abgefangener Ausnahmen verantwortlich ist. Wenn Sie eine benutzerdefinierte-Klasse auswählen, sollten Sie die Datei für diese Klasse in src/Error platzieren. Diese Klasse muss eine render()-Methode implementieren.

Protokoll

bool

Wenn wahr, werden Ausnahmen und ihre Stack-Traces in CakeLogLog protokolliert.

skipLog

Array

Ein Array von Ausnahmeklassennamen, die nicht protokolliert werden sollten. Dies ist nützlich, um NotFoundExceptions oder andere häufige, aber uninteressante Protokollmeldungen zu entfernen.

extraFatalErrorMemory

int

Legen Sie die Anzahl der Megabyte fest, um die das Speicherlimit erhöht werden soll, wenn ein schwerwiegender Fehler auftritt. Dies gibt Spielraum für die vollständige Protokollierung oder Fehlerbehandlung.

Example

Make changes in the config/routes.php file as shown in the following code.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
   $builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf');
   //$builder->connect('/pages',['controller'=>'Pages','action'=>'display', 'home']);
   $builder->connect('/exception/:arg1/:arg2',
      ['controller'=>'Exps','action'=>'index'],
      ['pass' => ['arg1', 'arg2']]);
   $builder->fallbacks();
});

Create ExpsCakePHP-Kurzanleitung.php file at src/CakePHP-Kurzanleitung/ExpsCakePHP-Kurzanleitung.php. Copy the following code in the controller file.

src/CakePHP-Kurzanleitung/ExpsCakePHP-Kurzanleitung.php

<?php namespace App\CakePHP-Kurzanleitung;
   use App\CakePHP-Kurzanleitung\AppCakePHP-Kurzanleitung;
   use Cake\Core\Exception\Exception;
   class ExpsCakePHP-Kurzanleitung extends AppCakePHP-Kurzanleitung {
      public function index($arg1,$arg2) {
         try{
            $this->set('argument1',$arg1);
            $this->set('argument2',$arg2);
            if(($arg1 > 1 || $arg1 > 10) || ($arg2  10))
               throw new Exception("One of the number is out of range [1-10].");
         } catch(\Exception $ex){
            echo $ex->getMessage();
         }
      }
   }
?>

Create a directory Exps at src/Template and under that directory create a View file called index.php. Copy the following code in that file.

src/Template/Exps/index.php

This is CakePHP tutorial and this is an example of Passed arguments.<br>
Argument-1: =$argument1?><br>
Argument-2: =$argument2?><br>

Execute the above example by visiting the following URL.

http://localhost/cakephp4/exception/5/0

Output

Upon execution, you will receive the following output.

CakePHP - Logging

Logging in CakePHP is a very easy task. You just have to use one function. You can log errors, exceptions, user activities, action taken by users, for any background process like cronjob. Logging data in CakePHP is easy. The log() function is provided by the LogTrait, which is the common ancestor for almost all CakePHP classes.

Logging Configuration

We can configure the log in file config/app.php. There is a log section in the file, where you can configure logging options as shown in the following screenshot.

By default, you will see two log levels − error and debug already configured for you. Each will handle different level of messages.

CakePHP supports various logging levels as shown below −

• Emergency − System is unusable

• Alert − Action must be taken immediately

• Critical − Critical conditions

• Error − Error conditions

• Warning − Warning conditions

• Notice − Normal but significant condition

• Info − Informational messages

• Debug − Debug-level messages

Writing to Log file

There are two ways by which, we can write in a Log file.

The first is to use the static write() method. The following is the syntax of the static write() method.

Syntax	write( integer|string $level, mixed $message, string|array $context [] )
Parameters	The severity level of the message being written. The value must be an integer or string matching a known level. Message content to log. Additional data to be used for logging the message. The special scope key can be passed to be used for further filtering of the log engines to be used. If a string or a numerically index array is passed, it will be treated as the scope key. See Cake\Log\Log::config() for more information on logging scopes.
Returns	boolean
Description	Writes the given message and type to all of the configured log adapters. Configured adapters are passed both the $level and $message variables. $level is one of the following strings/values.

The second is to use the log() shortcut function available on any using the LogTrait Calling log() will internally call Log::write() −

Example

Make changes in the config/routes.php file as shown in the following program.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
   $builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf');
   //$builder->connect('/pages',
      ['controller'=>'Pages','action'=>'display', 'home']);
   $builder->connect('logex',['controller'=>'Logexs','action'=>'index']);
   $builder->fallbacks();
});

Create a LogexsCakePHP-Kurzanleitung.php file at src/CakePHP-Kurzanleitung/LogexsCakePHP-Kurzanleitung.php. Copy the following code in the controller file.

src/CakePHP-Kurzanleitung/LogexsCakePHP-Kurzanleitung.php

<?php namespace App\CakePHP-Kurzanleitung;
   use App\CakePHP-Kurzanleitung\AppCakePHP-Kurzanleitung;
   use Cake\Log\Log;
   class LogexsCakePHP-Kurzanleitung extends AppCakePHP-Kurzanleitung{
      public function index(){
         /*The first way to write to log file.*/
         Log::write('debug',"Something didn't work.");
         /*The second way to write to log file.*/
         $this->log("Something didn't work.",'debug');
      }
   }
?>

Create a directory Logexs at src/Template and under that directory create a View file called index.php. Copy the following code in that file.

src/Template/Logexs/index.php

Something is written in log file. Check log file logs\debug.log

Execute the above example by visiting the following URL.

http://localhost/cakephp4/logex

Output

Upon execution, you will receive the following output.

The logs will be added to log/debug.log file −

CakePHP - Form Handling

CakePHP provides various in built tags to handle HTML forms easily and securely. Like many other PHP frameworks, major elements of HTML are also generated using CakePHP. Following are the various functions used to generate HTML elements.

The following functions are used to generate select options −

Syntax	_selectCakePHP-Kurzanleitung( array $elementsarray(), array $parentsarray(), boolean $showParentsnull, array $attributesarray() )
Parameters	Elements to format Parents for OPTGROUP Whether to show parents HTML attributes
Returns	array
Description	Returns an array of formatted OPTION/OPTGROUP elements

The following functions are used to generate HTML select element.

Syntax	select( string $fieldCakePHP-Kurzanleitung, array $options array(), array $attributes array() )
Parameters	CakePHP-Kurzanleitung attribute of the SELECT Array of the OPTION elements (as 'value'=>'Text' pairs) to be used in the SELECT element.
Returns	Formatted SELECT element.
Description	Returns a formatted SELECT element.

The following functions are used to generate button on HTML page.

Syntax	Button(string $title, array $optionsarray() )
Parameters	The button's caption. Not automatically HTML encoded. Array of options and HTML attributes
Returns	HTML button tag.
Description	Creates a tag. The type attribute defaults to type="submit". You can change it to a different value by using $options['type'].

The following functions are used to generate checkbox on HTML page.

Syntax	Checkbox(string $fieldCakePHP-Kurzanleitung, array $optionsarray() )
Parameters	CakePHP-Kurzanleitung of a field, like this "Modelname.fieldname" Array of HTML attributes. Possible options are value, checked, hiddenField, disabled, default.
Returns	An HTML text input element.
Description	Creates a checkbox input widget.

Die folgenden Funktionen werden zum Erstellen eines Formulars auf einer HTML-Seite verwendet.

Syntax

create( gemischt $modelnull , Array $optionsarray() )

Parameter

• Syntax	create( mixed $modelnull , array $optionsarray() )
  Parameters	The model name for which the form is being defined. Should include the plugin name for plugin models. e.g. ContactManager.Contact. If an array is passed and $options argument is empty, the array will be used as options. If false, no model is used. An array of html attributes and options. Possible options are type, action, url, default, onsubmit, inputDefaults, encoding.
  Returns	A formatted opening FORM tag.
  Description	Returns an HTML FORM element.

  Der Modellname, für den das Formular definiert wird. Sollte den Plugin-CakePHP-Kurzanleitungn für Plugin-Modelle enthalten. z.B. ContactManager.Kontakt. Wenn ein Array übergeben wird und das Argument $options leer ist, wird das Array als Optionen verwendet. Bei false wird kein Modell verwendet.

• Ein Array von HTML-Attributen und -Optionen. Mögliche Optionen sind Typ, Aktion, URL, Standard, onsubmit, inputDefaults, Kodierung.

Returns

Ein formatiertes öffnendes FORM-Tag.

Beschreibung

Gibt ein HTML-FORM-Element zurück.

Syntax	file(string $fieldCakePHP-Kurzanleitung, array $optionsarray() )
Parameters	CakePHP-Kurzanleitung of a field, in the form "Modelname.fieldname" Array of HTML attributes.
Returns	A generated file input.
Description	Creates file input widget.

Die folgenden Funktionen werden verwendet, um

Funktionalität zum Hochladen von Dateien bereitzustellen

auf einer HTML-Seite.

Syntax

file(string $fieldCakePHP-Kurzanleitung, array $optionsarray() )

Parameter

• Syntax	hidden( string $fieldCakePHP-Kurzanleitung , array $optionsarray() )
  Parameters	CakePHP-Kurzanleitung of a field, in the form of "Modelname.fieldname" Array of HTML attributes.
  Returns	A generated hidden input
  Description	Creates a hidden input field

  CakePHP-Kurzanleitung eines Feldes, in der Form „Modellname.Feldname“

• Array von HTML-Attributen.

Returns

Eine generierte Dateieingabe.

Beschreibung

Erstellt ein Dateieingabe-Widget.

Syntax	Input(string $fieldCakePHP-Kurzanleitung , array $options array() )
Parameters	This should be "Modelname.fieldname" Each type of input takes different options
Returns	Completed form widget
Description	Generates a form input element complete with label and wrapper div

Die folgenden Funktionen werden verwendet, um verstecktes Element auf einer HTML-Seite zu erstellen.

Syntax

Syntax	Radio(string $fieldCakePHP-Kurzanleitung , array $optionsarray() , array $attributesarray() )
Parameters	CakePHP-Kurzanleitung of a field, like this "Modelname.fieldname" Radio button options array. Array of HTML attributes, and special attributes above.
Returns	Completed radio widget set
Description	Creates a set of radio widgets. Will create a legend and fieldset by default. Use $options to control this.

hidden( string $fieldCakePHP-Kurzanleitung , Array $optionsarray() )

Parameter

• CakePHP-Kurzanleitung eines Feldes, in der Form „Modelname.fieldname“

• Array von HTML-Attributen.

Returns

Eine generierte versteckte Eingabe

Syntax	Submit(string $caption null, array $options array() )
Parameters	The label appearing on the button OR if string contains :// or the extension .jpg, .jpe, .jpeg, .gif, .png. Use an image if the extension exists, AND the first character is /, image is relative to webroot, OR if the first character is not /, image is relative to webroot/img. Array of options. Possible options are div, before, after, type etc.
Returns	An HTML submit button
Description	Creates a submit button element. This method will generate elements that can be used to submit, and reset forms by using $options. Image submits can be created by supplying an image path for $caption.

Beschreibung

Erstellt ein verstecktes Eingabefeld

Die folgenden Funktionen werden verwendet, um Eingabeelement auf einer HTML-Seite zu generieren.

Syntax	Input(string $fieldCakePHP-Kurzanleitung , array $options array() )
Parameter	Dies sollte „Modelname.fieldname“ sein Jede Eingabeart erfordert unterschiedliche Optionen
Returns	Widget „Ausgefülltes Formular“
Beschreibung	Erzeugt ein Formulareingabeelement komplett mit Label und Wrapper-Div

Die folgenden Funktionen werden verwendet, um Radio-Buttons auf einer HTML-Seite zu generieren.

Syntax	Radio(string $fieldCakePHP-Kurzanleitung , Array $optionsarray() , Array $attributesarray() ) td>
Parameter	CakePHP-Kurzanleitung eines Feldes, etwa „Modelname.fieldname“ CakePHP-Kurzanleitungfeld für CakePHP-Kurzanleitungfelder. Array von HTML-Attributen und speziellen Attributen oben.
Returns	Fertiggestellter Radio-Widget-Satz
Beschreibung	Erstellt eine Reihe von Radio-Widgets. Erstellt standardmäßig eine Legende und einen Feldsatz. Verwenden Sie $options, um dies zu steuern.

Die folgenden Funktionen werden verwendet, um die Schaltfläche Senden auf der HTML-Seite zu generieren. angegeben wird

Syntax	Submit(string $caption null, array $options array() )
Parameter	Die auf der Schaltfläche angezeigte Beschriftung ODER wenn die Zeichenfolge :// oder die Erweiterung .jpg, .jpe, .jpeg, .gif, .png enthält. Verwenden Sie ein Bild, wenn die Erweiterung vorhanden ist UND das erste Zeichen / ist, das Bild relativ zu Webroot ist, ODER wenn das erste Zeichen nicht / ist, das Bild relativ zu Webroot/img ist. Array von Optionen. Mögliche Optionen sind div, before, after, type usw.
Returns	Eine HTML-Senden-Schaltfläche
Beschreibung	Erstellt ein Submit-Button-Element. Diese Methode generiert Elemente, die zum Senden und Zurücksetzen von Formularen mithilfe von $options verwendet werden können. Bildübermittlungen können erstellt werden, indem ein Bildpfad für $caption.

The following functions are used to generate textarea element on HTML page.

Syntax	Textarea(string $fieldCakePHP-Kurzanleitung , array $options array() )
Parameters	CakePHP-Kurzanleitung of a field, in the form "Modelname.fieldname" Array of HTML attributes, special option like escape
Returns	A generated HTML text input element
Description	Creates a textarea widget

Example

Make changes in the config/routes.php file as shown in the following code.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
   $builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf');
   //$builder->connect('/pages',['controller'=>'Pages','action'=>'display', 'home']);
   $builder->connect('register',['controller'=>'Registrations','action'=>'index']);
   $builder->fallbacks();
});

Create a RegistrationsCakePHP-Kurzanleitung.php file at

src/CakePHP-Kurzanleitung/RegistrationsCakePHP-Kurzanleitung.php. Copy the following code in the controller file.

src/CakePHP-Kurzanleitung/RegistrationsCakePHP-Kurzanleitung.php

<?php namespace App\CakePHP-Kurzanleitung;
   use App\CakePHP-Kurzanleitung\AppCakePHP-Kurzanleitung;
   class RegistrationsCakePHP-Kurzanleitung extends AppCakePHP-Kurzanleitung{
      public function index(){
         $country = array('India','United State of America','United Kingdom');
         $this->set('country',$country);
         $gender = array('Male','Female');
         $this->set('gender',$gender);
      }
   }
?>

Create a directory Registrations at src/Template and under that directory, create a View file called index.php. Copy the following code in that file.

src/Template/Registrations/index.php

<?php echo $this->Form->create(NULL,array('url'=>'/register'));
   echo '<label for="country">Country</label>';
   echo $this->Form->select('country',$country);
   echo '<label for="gender">Gender</label>';
   echo $this->Form->radio('gender ',$gender);
   echo '<label for="address">Address</label>';
   echo $this->Form->textarea('address');
   echo $this->Form->file('profilepic');
   echo '<div>'.$this->Form->checkbox('terms').
      '<label for="country">Terms &mp; CakePHP-Kurzanleitungs</label>
</div>';
   echo $this->Form->button('Submit');
   echo $this->Form->end();
?>

Execute the above example by visiting the following URL −

http://localhost/cakephp4/register

Output

Upon execution, you will receive the following output.

CakePHP - Internationalization

Like many other frameworks, CakePHP also supports Internationalization. We need to follow these steps to go from single language to multiple language.

Step 1

Create a separate locales directory resources\locales.

Step 2

Create subdirectory for each language, under the directory src\Locale. The name of the subdirectory can be two letter ISO code of the language or full locale name like en_US, fr_FR etc.

Step 3

Create separate default.po file under each language subdirectory. This file contains entry in the form of msgid and msgstr, as shown in the following program.

msgid "msg"
msgstr "CakePHP Internationalization example."

Here, the msgid is the key which will be used in the View template file and msgstr is the value which stores the translation.

Step 4

In the View template file, we can use the above msgid, as shown below which will be translated based on the set value of locale.

<?php echo __('msg'); ?>

The default locale can be set in the config/app.php file by the following line.

'defaultLocale' => env('APP_DEFAULT_LOCALE', 'en_US')

To change the local at runtime, we can use the following lines.

use Cake\I18n\I18n;
I18n::locale('de_DE');

Example

Make changes in the config/routes.php file as shown in the following program.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
   $builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf');
   //$builder->connect('/pages',
      ['controller'=>'Pages','action'=>'display', 'home']);
   $builder->connect('locale',
      ['controller'=>'Localizations','action'=>'index']);
   $builder->fallbacks();
});

Create a LocalizationsCakePHP-Kurzanleitung.php file at src/CakePHP-Kurzanleitung/LocalizationsCakePHP-Kurzanleitung.php. Copy the following code in the controller file.

src/CakePHP-Kurzanleitung/LocalizationsCakePHP-Kurzanleitung.php

<?php namespace App\CakePHP-Kurzanleitung;
   use App\CakePHP-Kurzanleitung\AppCakePHP-Kurzanleitung;
   use Cake\I18n\I18n;
   class LocalizationsCakePHP-Kurzanleitung extends AppCakePHP-Kurzanleitung {
      public function index() {
         if($this->request->is('post')) {
            $locale = $this->request->getData('locale');
            I18n::setLocale($locale);
         }
      }
   }
?>

Create a locales directory at resources\locales. Create 3 directories called en_US, fr_FR, de_DE under the locales directory. Create a file under each directory called default.po. Copy the following code in the respective file.

resources/locales/en_US/default.po

msgid "msg"
msgstr "CakePHP Internationalization example."

resources/locales/fr_FR/default.po

msgid "msg"
msgstr "Exemple CakePHP internationalisation."

resources/locales/de_DE/default.po

msgid "msg"
msgstr "CakePHP Internationalisierung Beispiel."

Create a directory Localizations at src/Template and under that directory, create a View file called index.php. Copy the following code in that file.

src/Template/Localizations/index.php

Form->create(NULL,array('url'=>'/locale'));
   echo $this->Form->radio("locale",
      [
         ['value'=>'en_US','text'=>'CakePHP-Kurzanleitung'],
         ['value'=>'de_DE','text'=>'German'],
         ['value'=>'fr_FR','text'=>'French'],
      ]
   );
   echo $this->Form->button('Change Language');
   echo $this->Form->end();
?>
<?php echo __('msg'); ?>

Execute the above example by visiting the following URL. http://localhost/cakephp4/locale

Output

Upon execution, you will receive the following output.

Email

CakePHP provides Email class to manage email related functionalities. To use email functionality in any controller, we first need to load the Email class by writing the following line.

use Cake\Mailer\Email;

The Email class provides various useful methods which are described below.

Syntax	From(string|array|null $email null, string|null $name null )
Parameters	String with email CakePHP-Kurzanleitung
Returns	array|$this
Description	It specifies from which email address; the email will be sent

Syntax	To(string|array|null $emailnull, string|null $namenull)
Parameters	String with email CakePHP-Kurzanleitung
Returns	array|$this
Description	It specifies to whom the email will be sent

Syntax	Send(string|array|null $contentnull)
Parameters	String with message or array with messages.
Returns	array
Description	Send an email using the specified content, template and layout

Syntax	Subject(string|null $subjectnull)
Parameters	Subject string
Returns	array|$this
Description	Get/Set Subject

Syntax	Attachments(string|array|null $attachmentsnull)
Parameters	String with the filename or array with filenames
Returns	array|$this
Description	Add attachments to the email message

Syntax	Bcc(string|array|null $emailnull, string|null $namenull)
Parameters	String with email CakePHP-Kurzanleitung
Returns	array|$this
Description	Bcc

Syntax	cc( string|array|null $emailnull , string|null $namenull )
Parameters	String with email CakePHP-Kurzanleitung
Returns	array|$this
Description	Cc

Example

Make changes in the config/routes.php file as shown in the following program.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
   $builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf');
   //$builder->connect('/pages',['controller'=>'Pages','action'=>'display', 'home']);
   $builder->connect('/email',['controller'=>'Emails','action'=>'index']);
   $builder->fallbacks();
});

Create an EmailsCakePHP-Kurzanleitung.php file at src/CakePHP-Kurzanleitung/EmailsCakePHP-Kurzanleitung.php. Copy the following code in the controller file.

src/CakePHP-Kurzanleitung/EmailsCakePHP-Kurzanleitung.php

<?php namespace App\CakePHP-Kurzanleitung;
   use App\CakePHP-Kurzanleitung\AppCakePHP-Kurzanleitung;
   use Cake\Mailer\Email;
   class EmailsCakePHP-Kurzanleitung extends AppCakePHP-Kurzanleitung{
      public function index(){
         $email = new Email('default');
         $email->to('abc@gmail.com')
            ->subject('About')
            ->send('My message');
      }
   }
?>

Create a directory Emails at src/Template and under that directory, create a View file called index.php. Copy the following code in that file.

src/Template/Emails/index.php

Email Sent.

Before we send any email, we need to configure it. In the below screenshot, you can see that there are two transports, default and Gmail. We have used Gmail transport.

You need to replace the “GMAIL USERNAME” with your Gmail username and “APP PASSWORD” with your applications password. You need to turn on 2-step verification in Gmail and create a new APP password to send email.

config/app.php

Execute the above example by visiting the following URL − http://localhost/cakephp/email

Output

Upon execution, you will receive the following output.

CakePHP - Session Management

Session allows us to manage unique users across requests, and stores data for specific users. Session data can be accessible anywhere, anyplace, where you have access to request object, i.e., sessions are accessible from controllers, views, helpers, cells, and components.

Accessing Session Object

Session object can be created by executing the following code.

$session = $this->request->session();

Writing Session Data

To write something in session, we can use the write() session method.

Session::write($key, $value)

The above method will take two arguments, the value and the key under, which the value will be stored.

Example

$session->write('name', 'CakePHP-Kurzanleitung Gandhi');

Reading Session Data

To retrieve stored data from session, we can use the read() session method.

Session::read($key)

The above function will take only one argument, that is the key of the value, which was used at the time of writing session data. Once the correct key was provided, then the function will return its value.

Example

$session->read('name');

When you want to check whether, particular data exists in the session or not, then you can use the check() session method.

Session::check($key)

The above function will take only key as the argument.

Example

if ($session->check('name')) {
   // name exists and is not null.
}

Delete Session Data

To delete data from session, we can use the delete() session method to delete the data.

Session::delete($key)

The above function will take only key of the value to be deleted from session.

Example

$session->delete('name');

When you want to read and then delete data from session then, we can use the consume() session method.

static Session::consume($key)

The above function will take only key as argument.

Example

$session->consume('name');

Destroying a Session

We need to destroy a user session, when the user logs out from the site and to destroy the session the destroy() method is used.

Session::destroy()

Example

$session->destroy();

Destroying session will remove all session data from server, but will not remove session cookie.

Renew a Session

In a situation, where you want to renew user session then, we can use the renew() session method.

Session::renew()

Example

$session->renew();

Complete Session

Make changes in the config/routes.php file as shown in the following program.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
   $builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf');
   //$builder->connect('/pages',['controller'=>'Pages','action'=>'display', 'home']);
   $builder->connect('/session-object',['controller'=>'Sessions','action'=>'index']);
   $builder->connect('/session-read',['controller'=>'Sessions','action'=>'retrieve_session_data']);
   $builder->connect('/session-write',['controller'=>'Sessions','action'=> 'write_session_data']);
   $builder->connect('/session-check',['controller'=>'Sessions','action'=>'check_session_data']);
   $builder->connect('/session-delete',['controller'=>'Sessions','action'=>'delete_session_data']);
   $builder->connect('/session-destroy',['controller'=>'Sessions','action'=>'destroy_session_data']);
   $builder->fallbacks();
});

Create a SessionsCakePHP-Kurzanleitung.php file at src/CakePHP-Kurzanleitung/SessionsCakePHP-Kurzanleitung.php. Copy the following code in the controller file

src/CakePHP-Kurzanleitung/SessionsCakePHP-Kurzanleitung.php

<?php namespace App\CakePHP-Kurzanleitung;
use App\CakePHP-Kurzanleitung\AppCakePHP-Kurzanleitung;
   class SessionsCakePHP-Kurzanleitung extends AppCakePHP-Kurzanleitung {
   public function retrieveSessionData() {
      //create session object
      $session = $this->request->getSession();
      //read data from session
      $name = $session->read('name');
      $this->set('name',$name);
   }
   public function writeSessionData(){
      //create session object
      $session = $this->request->getSession();
      //write data in session
      $session->write('name','CakePHP-Kurzanleitung Gandhi');
   }
   public function checkSessionData(){
      //create session object
      $session = $this->request->getSession();
      //check session data
      $name = $session->check('name');
      $address = $session->check('address');
      $this->set('name',$name);
      $this->set('address',$address);
   }
   public function deleteSessionData(){
      //create session object
      $session = $this->request->getSession();
      //delete session data
      $session->delete('name');
   }
   public function destroySessionData(){
      //create session object
      $session = $this->request->getSession();
      //destroy session
      $session->destroy();
   }
}
?>

Create a directory Sessions at src/Template and under that directory create a View file called write_session_data.php. Copy the following code in that file.

src/Template/Sessions/write_session_data.php

The data has been written in session.

Create another View file called retrieve_session_data.php under the same Sessions directory and copy the following code in that file.

src/Template/Sessions/retrieve_session_data.php

Here is the data from session.
CakePHP-Kurzanleitung: =$name;?>

Create another View file called check_session_data.ctp under the same Sessions directory and copy the following code in that file.

src/Template/Sessions/check_session_data.ctp

<?php if($name): ?>
name exists in the session.
<?php else: ?>
name doesn't exist in the database
<?php endif;?>
<?php if($address): ?>
address exists in the session.
<?php else: ?>
address doesn't exist in the database
<?php endif;?>

Create another View file called delete_session_data.ctp, under the same Sessions directory and copy the following code in that file.

src/Template/Sessions/delete_session_data.ctp

Data deleted from session.

Create another View file called destroy_session_data.ctp, under the same Sessions directory and copy the following code in that file.

src/Template/Sessions/destroy_session_data.ctp

Session CakePHP-Kurzanleitung.

Output

Execute the above example by visiting the following URL. This URL will help you write data in session.

http://localhost/cakephp4/session-write

Visit the following URL to read session data − http://localhost/cakephp4/session-read

Visit the following URL to check session data − http://localhost/cakephp4/session-check

Visit the following URL to delete session data − http://localhost/cakephp4/session-delete Visit the

Visit the following URL to destroy session data − http://localhost/cakephp4/session-destroy

CakePHP - CakePHP-Kurzanleitung Management

Handling CakePHP-Kurzanleitung with CakePHP is easy and secure. There is a CakePHP-KurzanleitungComponent class which is used for managing CakePHP-Kurzanleitung. The class provides several methods for working with CakePHP-Kurzanleitungs.

To work with cookies, add this 2 classes to your controller −

use Cake\Http\CakePHP-Kurzanleitung\CakePHP-Kurzanleitung;
use Cake\Http\CakePHP-Kurzanleitung\CakePHP-KurzanleitungCollection;

The cookie object has to be created first to register a cookie.

$cookie = new CakePHP-Kurzanleitung(name,value,expiration time,path,domain);

The name and value are mandatory and others are optional param.

Write CakePHP-Kurzanleitung

Following is the syntax to write a cookie.

$cookie = new CakePHP-Kurzanleitung(name,value,expiration time,path,domain);

The cookie created has to be added to cookieCollection as shown below −

$cookie = new CakePHP-Kurzanleitung('name','XYZ');
$cookies = new CakePHP-KurzanleitungCollection([$cookie]);

If the cookie collection object is already created, the rest of the cookies can be added as shown below −

$cookies = $cookies->add($cookie);

Read CakePHP-Kurzanleitung

To read cookie make use of get() method from cookiecollection.

Syntax

The syntax for read cookie is as follows −

Cake\Http\CakePHP-Kurzanleitung\CakePHP-KurzanleitungCollection::get($name)

This will return you cookiecollection Interface, to get the value of the cookie, you will have to call the method getValue().

Cake\Http\CakePHP-Kurzanleitung\CakePHP-KurzanleitungCollection Interface::getValue()

Check CakePHP-Kurzanleitung

The has() method from cookieCollection will tell you, if the cookie is present or not.

Cake\Http\CakePHP-Kurzanleitung\CakePHP-KurzanleitungCollection::has($name)

Example

echo $isPresent = $this->cookies->has('name');

Delete CakePHP-Kurzanleitung

The remove() method is used to delete cookie. Following is the syntax of the remove() method.

Cake\Http\CakePHP-Kurzanleitung\CakePHP-KurzanleitungCollection::remove($name)

The remove() method will take one argument, the name of cookie variable ($name) to delete.

Example 1

$test = $this->cookies->remove('name');

Example 2

Make changes in the config/routes.php file as shown in the following program.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
   $builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf');
   //$builder->connect('/pages',['controller'=>'Pages','action'=>'display', 'home']);
   $builder->connect('cookie/testcookies',['controller'=>'CakePHP-Kurzanleitungs','action'=>'testCakePHP-Kurzanleitungs']);
   $builder->fallbacks();
});

Create a CakePHP-KurzanleitungsCakePHP-Kurzanleitung.php file at src/CakePHP-Kurzanleitung/CakePHP-KurzanleitungsCakePHP-Kurzanleitung.php. Copy the following code in the controller file.

src/CakePHP-Kurzanleitung/CakePHP-Kurzanleitungs/CakePHP-KurzanleitungsCakePHP-Kurzanleitung.php

<?php namespace App\CakePHP-Kurzanleitung;
   use App\CakePHP-Kurzanleitung\AppCakePHP-Kurzanleitung;
   use Cake\Http\CakePHP-Kurzanleitung\CakePHP-Kurzanleitung;
   use Cake\Http\CakePHP-Kurzanleitung\CakePHP-KurzanleitungCollection;
   class CakePHP-KurzanleitungsCakePHP-Kurzanleitung extends AppCakePHP-Kurzanleitung{
      public $cookies;
      public function testCakePHP-Kurzanleitungs() {
         $cookie = new CakePHP-Kurzanleitung('name','XYZ');
         $this->cookies = new CakePHP-KurzanleitungCollection([$cookie]);
         $cookie_val = $this->cookies->get('name');
         $this->set('cookie_val',$cookie_val->getValue());
         $isPresent = $this->cookies->has('name');
         $this->set('isPresent',$isPresent);
         $this->set('count', $this->cookies->count());
         $test = $this->cookies->remove('name');
         $this->set('count_afterdelete', $test->count());
      }
   }
?>

Create a directory CakePHP-Kurzanleitungs at src/Template and under that directory create a View file called test_cookies.php. Copy the following code in that file.

src/Template/CakePHP-Kurzanleitung/test_cookies.php

The value of the cookie is: <?php echo $cookie_val; ?>

<br>
<?php if($isPresent):
?>
The cookie is present.
<?php else:
?>
The cookie isn't present.
<?php endif;
?>
<br>
<?php echo "The count of cookie before delete is :" .$count;
?>
<br>
<?php echo "The count of cookie after delete is :" .$count_afterdelete;
?>

Output

Execute the above example by visiting the following URL − http://localhost/cakephp4/cookie/testcookies

CakePHP - Security

Security is another important feature while building web applications. It assures the users of the website that, their data is secured. CakePHP provides some tools to secure your application.

Encryption and Decryption

Security library in CakePHP provides methods, by which we can encrypt and decrypt data. Following are the two methods, which are used for the same purpose.

static Cake\Utility\Security::encrypt($text, $key, $hmacSalt = null)
static Cake\Utility\Security::decrypt($cipher, $key, $hmacSalt = null)

The encrypt method will take text and key as the argument to encrypt data and the return value will be the encrypted value with HMAC checksum.

To hash a data, hash() method is used. Following is the syntax of the hash() method.

static Cake\Utility\Security::hash($string, $type = NULL, $salt = false)

CSRF

CSRF stands for Cross Site Request Forgery. By enabling the CSRF Component, you get protection against attacks. CSRF is a common vulnerability in web applications.

It allows an attacker to capture and replay a previous request, and sometimes submit data requests using image tags or resources on other domains. The CSRF can be enabled by simply adding the CsrfComponent to your components array as shown below −

public function initialize(): void {
   parent::initialize();
   $this->loadComponent('Csrf');
}

The CsrfComponent integrates seamlessly with FormHelper. Each time you create a form with FormHelper, it will insert a hidden field containing the CSRF token.

While this is not recommended, you may want to disable the CsrfComponent on certain requests. You can do so by using the controller’s event dispatcher, during the beforeFilter() method.

public function beforeFilter(Event $event) {
   $this->eventManager()->off($this->Csrf);
}

Security Component

Security Component applies tighter security to your application. It provides methods for various tasks like −

• Restricting which HTTP methods your application accepts − You should always verify the HTTP method, being used before executing side-effects. You should check the HTTP method or use Cake\Network\Request::allowMethod() to ensure the correct HTTP method is used.

• Form tampering protection − By default, the SecurityComponent prevents users from tampering with forms in specific ways. The SecurityComponent will prevent the following things −

  • Unknown fields cannot be added to the form.

  • Fields cannot be removed from the form.

  • Values in hidden inputs cannot be modified.

• Requiring that SSL be used − All actions to require a SSL- secured

• Limiting cross controller communication − We can restrict which controller can send request to this controller. We can also restrict which actions can send request to this controller’s action.

Example

Make changes in the config/routes.php file as shown in the following program.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
   $builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf');
   //$builder->connect('/pages',
      ['controller'=>'Pages','action'=>'display', 'home']);
   $builder->connect('login',['controller'=>'Logins','action'=>'index']);
   $builder->fallbacks();
});

Create a LoginsCakePHP-Kurzanleitung.php file at src/CakePHP-Kurzanleitung/LoginsCakePHP-Kurzanleitung.php. Copy the following code in the controller file.

src/CakePHP-Kurzanleitung/LoginsCakePHP-Kurzanleitung.php

<?php namespace App\CakePHP-Kurzanleitung;
   use App\CakePHP-Kurzanleitung\AppCakePHP-Kurzanleitung;
   class LoginsCakePHP-Kurzanleitung extends AppCakePHP-Kurzanleitung {
      public function initialize() : void {
         parent::initialize();
         $this->loadComponent('Security');
      }
         public function index(){
      }
   }
?>

Create a directory Logins at src/Template and under that directory create a View file called index.php. Copy the following code in that file.

src/Template/Logins/index.php

<?php echo $this->Form->create(NULL,array('url'=>'/login'));
   echo $this->Form->control('username');
   echo $this->Form->control('password');
   echo $this->Form->button('Submit');
   echo $this->Form->end();
?>

Execute the above example by visiting the following URL − http://localhost/cakephp4/login

Output

Upon execution, you will receive the following output.

CakePHP - Validation

Often while making websites, we need to validate certain things before processing data further. CakePHP provides validation package, to build validators that can validate data with ease.

Validation Methods

CakePHP provides various validation methods in the Validation Class. Some of the most popular of them are listed below.

Syntax	Add(string $field, array|string $name, array|Cake\Validation\ValidationRule $rule [] )
Parameters	The name of the field from which the rule will be added. The alias for a single rule or multiple rules array. The rule to add
Returns	$this
Description	Adds a new rule to a field's rule set. If second argument is an array, then rules list for the field will be replaced with second argument and third argument will be ignored.

Syntax	allowEmpty(string $field, boolean|string|callable $whentrue, string|null $messagenull)
Parameters	The name of the field. Indicates when the field is allowed to be empty. Valid values are true (always), 'create', 'update'. If a callable is passed, then the field will be left empty only when the callback returns true. The message to show if the field is not.
Returns	$this
Description	Allows a field to be empty.
Syntax	alphanumeric (string $field, string|null $messagenull, string|callable|null $whennull)
Parameters	The field you want to apply the rule to. The error message when the rule fails. Either 'create' or 'update' or a callable that returns true when the validation rule should be applied.
Returns	$this
Description	Add an alphanumeric rule to a field.

Syntax	creditCard(string $field , string $type'all', string|null $messagenull, string|callable|null $whennull)
Parameters	The field you want to apply the rule to. The type of cards you want to allow. Defaults to 'all'. You can also supply an array of accepted card types, for example, ['mastercard', 'visa', 'amex']. The error message when the rule fails. Either 'create' or 'update' or a callable that returns true, when the validation rule should be applied.
Returns	$this
Description	Add a credit card rule to a field.

Syntax	Email(string $field , boolean $checkMXfalse, string|null $messagenull, string|callable|null, $whennull)
Parameters	The field you want to apply the rule to. Whether or not to check the MX records. The error message when the rule fails. Either 'create' or 'update' or a callable that returns true, when the validation rule should be applied.
Returns	$this
Description	Add an email validation rule to a field.

Syntax	maxLength(string $field, integer $max, string|null $messagenull, string|callable|null $whennull)
Parameters	The field you want to apply the rule to. The maximum length allowed. The error message when the rule fails. Either 'create' or 'update' or a callable that returns true when the validation rule should be applied.
Returns	$this
Description	Add a string length validation rule to a field.

Syntax	minLength(string $field, integer $min, string|null $messagenull, string|callable|null $whennull)
Parameters	The field you want to apply the rule to. The maximum length allowed. The error message when the rule fails. Either 'create' or 'update' or a callable, that returns true when the validation rule should be applied.
Returns	$this
Description	Add a string length validation rule to a field.

Syntax	notBlank(string $field, string|null $messagenull, string|callable|null $whennull)
Parameters	The field you want to apply the rule to. The error message when the rule fails. Either 'create' or 'update' or a callable that returns true when the validation rule should be applied.
Returns	$this
Description	Add a notBlank rule to a field.

CakePHP - Creating Validators

Validator can be created by adding the following two lines in the controller.

use Cake\Validation\Validator;
$validator = new Validator();

Validating Data

Once, we have created validator, we can use the validator object to validate data. The following code explains, how we can validate data for login webpage.

$validator->notEmpty('username', 'We need username.')->add(
   'username', 'validFormat', ['rule' => 'email','message' => 'E-mail must be valid']);

$validator->notEmpty('password', 'We need password.');
$errors = $validator->errors($this->request->data());

Using the $validator object, we have first called the notEmpty() method, which will ensure that the username must not be empty. After that, we have chained the add() method to add one more validation for proper email format.

After that we have added validation for password field with notEmpty() method, which will confirm that password field must not be empty.

Example

Make Changes in the config/routes.php file as shown in the following program.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
   $builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf');
   //$builder->connect('/pages',['controller'=>'Pages','action'=>'display', 'home']);
   $builder->connect('validation',['controller'=>'Valids','action'=>'index']);
   $builder->fallbacks();
});

Create a ValidsCakePHP-Kurzanleitung.php file at src/CakePHP-Kurzanleitung/ValidsCakePHP-Kurzanleitung.php. Copy the following code in the controller file.

src/CakePHP-Kurzanleitung/ValidsCakePHP-Kurzanleitung.php

<?php namespace App\CakePHP-Kurzanleitung;
   use App\CakePHP-Kurzanleitung\AppCakePHP-Kurzanleitung;
   use Cake\Validation\Validator;
   class ValidsCakePHP-Kurzanleitung extends AppCakePHP-Kurzanleitung{
      public function index(){
         $validator = new Validator();
         $validator->notEmpty('username', 'We need username.')->add(
            'username', 'validFormat', ['rule' => 'email','message' => 'E-mail must be valid']);
         $validator->notEmpty('password', 'We need password.');
         $errors = $validator->errors($this->request->getData());
         $this->set('errors',$errors);
      }
   }
?>

Create a directory Valids at src/Template and under that directory create a View file called index.php. Copy the following code in that file.

src/Template/Valids/index.php

<?php if($errors) {
      foreach($errors as $error)
      foreach($error as $msg)
      echo '<font color="red">'.$msg.'<br>';
   } else {
      echo "No errors.";
   }
   echo $this->Form->create(NULL,array('url'=>'/validation'));
   echo $this->Form->control('username');
   echo $this->Form->control('password');
   echo $this->Form->button('Submit');
   echo $this->Form->end();
?>

Execute the above example by visiting the following URL −

http://localhost/cakephp4/validation

Output

Click on the submit button without entering anything. You will receive the following output.

Http - Client

The http client can be used to make requests like GET, POST, PUT etc.

To work with http client, add the following −

use Cake\Http\Client;

Let us work on example to understand working of HTTP client.

HTTP GET Method

To get the data from give http url, you can do as follows −

$response = $http->get('https://jsonplaceholder.typicode.com/users');

In case, you need to pass some query params, they can be passed as follows −

$response = $http->get('https://jsonplaceholder.typicode.com/users', ["id", 1]);

To get the response, you can do as follows −

For normal text data −

$response->getBody();

For Json −

$response->getJson();

For Xml −

$response->getXml()

Example

Make Changes in the config/routes.php file as shown in the following program.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
   $builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf');
   //$builder->connect('/pages',['controller'=>'Pages','action'=>'display', 'home']);
   $builder->connect('getData',['controller'=>'Requests','action'=>'index']);
   $builder->fallbacks();
});

Create a RequestsCakePHP-Kurzanleitung.php file at src/CakePHP-Kurzanleitung/RequestsCakePHP-Kurzanleitung.php. Copy the following code in the controller file.

src/CakePHP-Kurzanleitung/RequestsCakePHP-Kurzanleitung.php

<?php namespace App\CakePHP-Kurzanleitung;
   use App\CakePHP-Kurzanleitung\AppCakePHP-Kurzanleitung;
   use Cake\Http\Client;
   class RequestsCakePHP-Kurzanleitung extends AppCakePHP-Kurzanleitung{
      public function index(){
         $http = new Client();
         $response = $http->get('https://jsonplaceholder.typicode.com/users');
         $stream = $response->getJson();
         $this->set('response',$stream);
      }
   }
?>

Create a directory Requests at src/Template and under that directory create a View file called index.php. Copy the following code in that file.

src/Template/Requests/index.php

<h3>All Users from url : https://jsonplaceholder.typicode.com/users</h3>
<?php if($response) {
      foreach($response as $res => $val) {
         echo '<font color="gray">CakePHP-Kurzanleitung: '.$val["name"].' Email -'.$val["email"].'</font><br>';
      }
   }
?>

Execute the above example by visiting the following URL −

http://localhost/cakephp4/getData

Output

Click on the submit button without entering anything. You will receive the following output.

HTTP POST Method

To work with post, you need to call $http client as follows −

$response = $http->post('yoururl', data);

Let us see one example on the same.

Example

Make Changes in the config/routes.php file as shown in the following program.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
   $builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf');
   //$builder->connect('/pages',['controller'=>'Pages','action'=>'display', 'home']);
   $builder->connect('postData',['controller'=>'Requests','action'=>'index']);
   $builder->fallbacks();
});

Create a RequestsCakePHP-Kurzanleitung.php file at src/CakePHP-Kurzanleitung/RequestsCakePHP-Kurzanleitung.php. Copy the following code in the controller file. Ignore if already created.

src/CakePHP-Kurzanleitung/RequestsCakePHP-Kurzanleitung.php

<?php namespace App\CakePHP-Kurzanleitung;
   use App\CakePHP-Kurzanleitung\AppCakePHP-Kurzanleitung;
   use Cake\Http\Client;
   class RequestsCakePHP-Kurzanleitung extends AppCakePHP-Kurzanleitung{
      public function index(){
         $http = new Client();
         $response = $http->post('https://postman-echo.com/post', [
            'name'=> 'ABC',
            'email' => 'xyz@gmail.com'
         ]);
      }
   }
?>

Create a directory Requests at src/Template and under that directory create a View file called index.php. Copy the following code in that file.

src/Template/Requests/index.php

<h3>Testing Post Method</h3>

Execute the above example by visiting the following URL −

http://localhost/cakephp4/postData

Output

Given below is the output of the code −

Similarly, you can try for PUT method.

$http = new Client();
$response = $http->put('https://postman-echo.com/post', [
   'name'=> 'ABC',
   'email' => 'xyz@gmail.com'
]);

CakePHP - Pagination

If we want to show a set of data that is huge, we can use pagination and this feature is available with cake php 4 which is very easy to use.

We have a table titled “articles” with following data −

Let us use pagination to display the data in the form of pages, instead of showing them all together.

Example

Make Changes in the config/routes.php file as shown in the following program.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
   $builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf');
   //$builder->connect('/pages',['controller'=>'Pages','action'=>'display', 'home']);
   $builder->connect('posts',['controller'=>'Posts','action'=>'index']);
   $builder->fallbacks();
});

Create a PostsCakePHP-Kurzanleitung.php file at src/CakePHP-Kurzanleitung/PostsCakePHP-Kurzanleitung.php. Copy the following code in the controller file. Ignore, if already created.

src/CakePHP-Kurzanleitung/PostsCakePHP-Kurzanleitung.php

<?php namespace App\CakePHP-Kurzanleitung;
   use App\CakePHP-Kurzanleitung\AppCakePHP-Kurzanleitung;
   class PostsCakePHP-Kurzanleitung extends AppCakePHP-Kurzanleitung {
      public function index(){
         $this->loadModel('articles');
         $articles = $this->articles->find('all')->order(['articles.id ASC']);
         $this->set('articles', $this->paginate($articles, ['limit'=> '3']));
      }
   }
?>

The data from articles table is fetched using −

$this->loadModel('articles');
$articles = $this->articles->find('all')->order(['articles.id ASC']);

To apply pagination and we would show the data with 3 per records and the same is done as follows −

$this->set('articles', $this->paginate($articles, ['limit'=> '3']));

This is enough to activate pagination on the articles tables.

Create a directory Posts at src/Template and under that directory create a Viewfile called index.php. Copy the following code in that file.

src/Template/Posts/index.php

<div>
<?php foreach ($articles as $key=>$article) {?>
<a href="#">
   <div>
   <p>= $article->title ?> </p>
   <p>= $article->details ?></p>
   </div>
</a>
<br>
<?php }
?>
<ul class="pagination">
= $this->Paginator->prev("
= $this->Paginator->numbers() ?>
= $this->Paginator->next(">>") ?>
</ul>
</div>

The pagination for the list of pages is done as follows −

= $this->Paginator->prev(" = $this->Paginator->numbers() ?> = $this->Paginator->next(">>") ?>

Execute the above example by visiting the following URL −

http://localhost/cakephp4/posts

Output

When you run the code, you will see the following output −

Click on the numbers below, to switch to next page, or use the next or previous button.

For example

You will see that page=2 is appended to the page url in the browser.

CakePHP - Date and Time

To work with date and time in cakephp4, we are going to make use of the available FrozenTime class.

To work with date and time, include the class in your controller

use Cake\I18n\FrozenTime;

Let us work, on an example and display date and time, using FrozenTime class.

Example

Make Changes in the config/routes.php file as shown in the following program.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
   $builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf');
   //$builder->connect('/pages',['controller'=>'Pages','action'=>'display', 'home']);
   $builder->connect('datetime',['controller'=>'Dates','action'=>'index']);
   $builder->fallbacks();
});

Create a DatesCakePHP-Kurzanleitung.php file at src/CakePHP-Kurzanleitung/DatesCakePHP-Kurzanleitung.php. Copy the following code in the controller file. Ignore if already created.

src/CakePHP-Kurzanleitung/DatesCakePHP-Kurzanleitung.php

<?php namespace App\CakePHP-Kurzanleitung;
   use App\CakePHP-Kurzanleitung\AppCakePHP-Kurzanleitung;
   use Cake\I18n\FrozenTime;
   class DatesCakePHP-Kurzanleitung extends AppCakePHP-Kurzanleitung{
      public function index(){
         $time = FrozenTime::now();
         $now = FrozenTime::parse('now');
         $_now = $now->i18nFormat('yyyy-MM-dd HH:mm:ss');
         $this->set('timenow', $_now);
         $now = FrozenTime::parse('now');
         $nice = $now->nice();
         $this->set('nicetime', $nice);
         $hebrewdate = $now->i18nFormat(\IntlDateFormatter::FULL, null, 'en-IR@calendar=hebrew');
         $this->set("hebrewdate",$hebrewdate);
         $japanesedate = $now->i18nFormat(\IntlDateFormatter::FULL, null, 'en-IR@calendar=japanese');
         $this->set("japanesedate",$japanesedate);
         $time = FrozenTime::now();
         $this->set("current_year",$time->year);
         $this->set("current_month",$time->month);
         $this->set("current_day",$time->day);
      }
   }
?>

Create a directory Dates at src/Template and under that directory create a View file called index.php. Copy the following code in that file.

src/Template/Dates/index.php

<?php echo "The Current date and time is = ".$timenow;
   echo "<br/>";
   echo "Using nice format available = ".$nicetime;
   echo "<br>";
   echo "Date and Time as per Hebrew Calender =" .$hebrewdate;
   echo "<br>";
   echo "Date and Time as per Japanese Calender =" .$japanesedate;
   echo "<br>";
   echo "Current Year = ".$current_year;
   echo "<br>";
   echo "Current Month = ".$current_month;
   echo "<br>";
   echo "Current Day = ".$current_day;
?>

Execute the above example by visiting the following URL −

http://localhost/cakephp4/datetime

Output

When you run the code, you will see the following output −

CakePHP - File upload

To work on file upload we are going to use the form helper. Here, is an example for file upload.

Example

Make Changes in the config/routes.php file, as shown in the following program.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
   $builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf');
   //$builder->connect('/pages',['controller'=>'Pages','action'=>'display', 'home']);
   $builder->connect('fileupload',['controller'=>'Files','action'=>'index']);
   $builder->fallbacks();
});

Create a FilesCakePHP-Kurzanleitung.php file at src/CakePHP-Kurzanleitung/FilesCakePHP-Kurzanleitung.php. Copy the following code in the controller file. Ignore, if already created.

Create uploads/ directory in src/. The files uploaded will be saved in uploads/ folder.

src/CakePHP-Kurzanleitung/FilesCakePHP-Kurzanleitung.php

<?php namespace App\CakePHP-Kurzanleitung;
   use App\CakePHP-Kurzanleitung\AppCakePHP-Kurzanleitung;
   use Cake\View\Helper\FormHelper;
   class FilesCakePHP-Kurzanleitung extends AppCakePHP-Kurzanleitung {
      public function index(){
         if ($this->request->is('post')) {
            $fileobject = $this->request->getData('submittedfile');
            $uploadPath = '../uploads/';
            $destination = $uploadPath.$fileobject->getClientFilename();
            // Existing files with the same name will be replaced.
            $fileobject->moveTo($destination);
         }
      }
   }
?>

Create a directory Files at src/Template and under that directory create a View file called index.php. Copy the following code in that file.

src/Template/Files/index.php

<?php echo $this->Form->create(NULL, ['type' => 'file']);
   echo $this-&gtl;Form->file('submittedfile');
   echo $this->Form->button('Submit');
   echo $this->Form->end();
   $uploadPath ='../uploads/';
   $files = scandir($uploadPath, 0);
   echo "Files uploaded in uploads/ are:<br>";
   for($i = 2; $i ";
?>

The files saved in uploads/ folder is listed for the user. Execute the above example by visiting the following URL −

http://localhost/cakephp4/fileupload −

Output

When you execute the above code, you should see the following output −

Das obige ist der detaillierte Inhalt vonCakePHP-Kurzanleitung. Für weitere Informationen folgen Sie bitte anderen verwandten Artikeln auf der PHP chinesischen Website!