Zend's MVC mechanism usage analysis (2)_PHP tutorial
Following the above article
Post the code
$front = Zend_Controller_Front::getInstance();
Zend_Layout::startMvc(array('layoutPath' => USVN_LAYOUTS_DIR));
$front->setRequest(new Zend_Controller_Request_Http());
$front->throwExceptions(true);
$front->setBaseUrl($config->url->base);
$router = new Zend_Controller_Router_Rewrite();
$ routes_config = new USVN_Config_Ini(USVN_ROUTES_CONFIG_FILE, USVN_CONFIG_SECTION);
$router->addConfig($routes_config, 'routes');
$front->setRouter($router);
$front-> setControllerDirectory(USVN_CONTROLLERS_DIR);
$front->dispatch();
In the previous article, I have finished reading the first two sentences of getInstance and startMvc functions . The following is to continue to analyze the subsequent code
setRequest($request) This is to determine whether the request is inherited from Zend_Controller_Request_Abstract. If so, assign the value of front's _request to it.
Here you need to understand what Zend_Controller_Request_Abstract is. It is an abstract class that abstracts all requests. Zend has provided two implementation classes, Zend_Controller_Request_Http and Zend_Controller_Request_Simple. Generally, when we build servers, we use http requests, so if your project needs to inherit again, it usually directly inherits Zend_Controller_Request_Http.
In Zend_controller_Request_Http, the usual Http options such as getQuery, getCookie, getRequestUri, getBasePath, getParams, getHeader, etc. that we often use are already available.
Continue to talk about its base class Zend_Controller_Request_Abstract. The methods of this class include:
Back to code
$front->setRequest(new Zend_Controller_Request_Http()); The constructor of Zend_Controller_Request_Http is called here. When the constructor is called for the first time, it is $this->setRequestUri(); many of the setRequestUri are direct Use the data in the PHP global variable $_SERVER to get the requestUri.
What you can learn from setRequestUri is how to obtain requestUri in different servers (especially the different variable combinations in $SERVER in IIS have different meanings), such as http://172.23.11.160/usvn/item/ usvn_test This url, its requestUri is /usvn/item/usvn_test
$front->throwExceptions(true); Set the internal _throwExceptions flag to true;
$front->setbaseUrl("/usvn") does two things. First, it sets the internal _baseUrl attribute of front. Second, it calls setBaseUrl of Request, which also sets the internal _baseUrl attribute of Zend_Controller_Request_Http.
$router = new Zend_Controller_Router_Rewrite();
$routes_config = new USVN_Config_Ini(USVN_ROUTES_CONFIG_FILE, USVN_CONFIG_SECTION);
$router->addConfig($routes_config, 'routes');
$front->setRouter($router);
The following three lines directly state that they actually use Zend’s Router module to use the configuration file. The router uses setRouter and is placed in the front.
Last sentence
$front->dispatch();
This function is also the most core function.
This function first registers a plug-in Zend_Controller_Plugin_ErrorHandler with an index of 100 and puts the plug-in order at the end.
The second step stores a Helper, Zend_Controller_Action_Helper_ViewRenderer, with an index of -80
Request is instantiated below, and request is a Zend_Controller_Request_Http type. And set the baseUrl of the request to the _baseUrl set previously, which is "/usvn/item/usvn_test"
Then the response is instantiated, and the response is a Zend_Controller_Response_Http();
The following uses plugins to set Request and Response. First, the setRequest function of Zend_Controller_Plugin_Broker is actually called. This function loops through all the plugins managed by the broker and calls the setRequest($request) function of the plugin (if any).
Next, initialize the router and set the parameters of the router. The router has been set previously, which is the Zend_Controller_Router_Rewrite type
Initialize the dispatcher dispatcher. We see the dispatcher for the first time, the Zend_Controller_Dispatcher_Standard class. Distributors will be discussed later.
The following process:
Call the routeStartup of the plug-in to process the request
Call the router’s route to handle the request
Call the plugin’s routeShutdown to process the request
Call the dispatchLoopStartup of the plug-in to process the request
Enter the cycle distribution process
Call the preDispatch of the plug-in to process the request
Call dispatcher’s dispatch to process request and response
Call the plug-in’s postDispatch to process the request
Get out of the loop distribution process
Call the plugin’s dispatchLoopShutdown to process the request
Send response

PHP is used to build dynamic websites, and its core functions include: 1. Generate dynamic content and generate web pages in real time by connecting with the database; 2. Process user interaction and form submissions, verify inputs and respond to operations; 3. Manage sessions and user authentication to provide a personalized experience; 4. Optimize performance and follow best practices to improve website efficiency and security.

PHP uses MySQLi and PDO extensions to interact in database operations and server-side logic processing, and processes server-side logic through functions such as session management. 1) Use MySQLi or PDO to connect to the database and execute SQL queries. 2) Handle HTTP requests and user status through session management and other functions. 3) Use transactions to ensure the atomicity of database operations. 4) Prevent SQL injection, use exception handling and closing connections for debugging. 5) Optimize performance through indexing and cache, write highly readable code and perform error handling.

Using preprocessing statements and PDO in PHP can effectively prevent SQL injection attacks. 1) Use PDO to connect to the database and set the error mode. 2) Create preprocessing statements through the prepare method and pass data using placeholders and execute methods. 3) Process query results and ensure the security and performance of the code.

PHP and Python have their own advantages and disadvantages, and the choice depends on project needs and personal preferences. 1.PHP is suitable for rapid development and maintenance of large-scale web applications. 2. Python dominates the field of data science and machine learning.

PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.

PHP makes it easy to create interactive web content. 1) Dynamically generate content by embedding HTML and display it in real time based on user input or database data. 2) Process form submission and generate dynamic output to ensure that htmlspecialchars is used to prevent XSS. 3) Use MySQL to create a user registration system, and use password_hash and preprocessing statements to enhance security. Mastering these techniques will improve the efficiency of web development.

PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.

PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.


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