Application and promotion of PSR2 and PSR4 specifications in Yii framework

Application and promotion of PSR2 and PSR4 specifications in Yii framework

Introduction:
With the increasing popularity of PHP development and the continuous improvement of the framework, coding standards and automatic loading methods are also becoming more and more important. This article will introduce the application and promotion of PSR2 and PSR4 specifications in the Yii framework, and provide specific code examples.

1. What are PSR2 and PSR4 specifications

1. PSR2 specification
   PSR2 specification is a standard for PHP coding specifications. It defines a series of naming styles, code structures and Format and other requirements, committed to improving the consistency of code within the team. In applications in the Yii framework, we can improve code readability and maintainability by following the PSR2 specification.
2. PSR4 specification
   PSR4 specification is a standard for PHP automatic loading specification. It defines a mapping relationship between namespaces and classes to facilitate developers to implement automatic loading and code organization. In applications in the Yii framework, we can better manage and load class files in the framework and applications by following the PSR4 specification.

2. Examples of applying the PSR2 specification in the Yii framework
The following are some specific examples of applying the PSR2 specification in the Yii framework:

1. Abbreviation Indentation and spaces
   In Yii framework, we can use 4 spaces as code indentation and add appropriate spaces around operators, for example:

   if ($condition) {
    $result = true;
   } else {
    $result = false;
   }

2. braces position
   In Yii framework, curly braces should always be on the same line as the control structure, with appropriate spaces before and after it, for example:

   if ($condition) {
    // 代码块
   }

3. Naming style
   In In the Yii framework, classes, methods and properties are named in camel case. Except for the first letter of the class name, all other places start with lowercase letters, for example:

   class UserController extends Controller
   {
    public function actionLogin()
    {
        // 方法体
    }
    
    protected function validateInput()
    {
        // 方法体
    }
    
    private $userName;
   }

4. Comment
   In the Yii framework, we can use comments in PHPDoc format to describe classes, methods and properties in detail, for example:

   /**
    * Class UserController
    * @package appcontrollers
    */
   class UserController extends Controller
   {
    /**
     * 用户登录操作
     */
    public function actionLogin()
    {
        // 方法体
    }
   }

3. Applying the PSR4 specification in the Yii framework Examples
The following are some specific examples of applying the PSR4 specification in the Yii framework:

1. Definition of namespace
   In the Yii framework, we can use namespaces to organize and Load class files, for example:

   namespace appcontrollers;
   
   use yiiwebController;
   
   class UserController extends Controller
   {
    // ... 省略代码
   }

2. Storage and naming of class files
   In the Yii framework, we can place class files in the corresponding namespace in accordance with the requirements of the PSR4 specification folder and use the class name as the file name, for example:

3. app

   • controllers
   • UserController.php

4. Composer configuration
   In the Yii framework, we can use Composer to automatically load class files by configuring composer.json Add the following configuration to the file to automatically load the Yii framework and applications:

   {
    "autoload": {
        "psr-4": {
            "app\": "app/",
            "yii\": "vendor/yiisoft/yii2/"
        }
    }
   }

4. Summary
By applying the PSR2 and PSR4 specifications, we can load the Yii framework in the Yii framework Improve code readability and maintainability, and better organize and load class files. This article provides some specific code examples, hoping to be helpful to developers using the Yii framework.

References:
[1] PSR-2: Coding Style Guide - PHP-FIG. https://www.php-fig.org/psr/psr-2/
[2 ] PSR-4: Autoloader - PHP-FIG. https://www.php-fig.org/psr/psr-4/

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