


thinkPHP empty module and empty operation, pre-operation and post-operation detailed introduction (14)_PHP tutorial
thinkPHP empty module and empty operation, pre-operation and post-operation detailed introduction (14)
This chapter: Introducing TP empty modules and empty operations, pre-operations and post-operations. Detailed introduction
1. Empty modules and empty operations
1. No operation
function _empty($name){
$this->show("$name does not exist www.Bkjia.com");
}
2. Empty module (EmptyAction.class.php file)
class EmptyAction extends Action{
function index(){
//$this->show('
This request method does not exist!
')$city=M('City');
$arr=$city->select();
$this->assign('list',$arr);
$name=MODULE_NAME; //Get the current module name, the manual constant reference has a bunch of similar constants
//http://localhost/thinkphp/index.php/Index/moBanXuanRan
//The module name is: Index
$this->display("City:$name");
}
}
Under the current module (controller), call methods under other modules:
//Call the method under the IndexAction controller under the CityAction controller
//Just download new and find the corresponding method later
class CityAction extends Action{
public function tiaozhuan(){
$indexAction = new IndexAction();
$indexAction->index();
}
}
?>
2. Pre-operation and post-operation
Explanation: www.Bkjia.com
For example: I am currently executing the http://localhost/thinkphp/index.php/Index/index index method
Pre-method: some logical operations performed before executing the index method
Post-method: some logical operations performed after executing the index method
Example: For example, if you have a website now, but you have to log in to access your website, you can use
Pre and post operations
1. Pre-operation: _before_operation name
2. Post operation : _after_ operation name
class IndexAction extends Action{
public _before_index(){
//Judge, if you are not logged in, jump to the homepage
//If you are not logged in, jump to the login page
if(!isset($_SESSION['username']) || $_SESSION['username']==''){
$this->redirect('Login/index'); //Jump to the index method under the Login controller
}
}
public function index(){
$user = M('User');
$arr = $user->select();
$this->assign('list',$arr);
$this->display();
}
public _after_index(){
$this->show('This is the post-operation of the index method!!');
}
}

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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