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Simple implementation of PHP autoloading

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Release: 2023-03-29 07:38:02
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这篇文章主要介绍了关于PHP 自动加载的简单实现,有着一定的参考价值,现在分享给大家,有需要的朋友可以参考一下

基于psr的规范,使用命名空间和spl_autoload_register()来实现自动加载

文件结构:

|--Api
  |--Account.php
  |--User.php
|--Service
  |--Login.php
  |--User.php

|--Application.php

Application.php

<?php
use Api\User;
use Service\User as User2;
class Application{
  public static function main(){
    self::registe();
    new User();
    new User2();
  }
  public static function registe(){
    spl_autoload_register("Application::loadClass");
  }
  public static function loadClass($class){
    $class=str_replace(&#39;\\&#39;, &#39;/&#39;, $class);
    $class="./".$class.".php";
    require_once $class;    
  }
}
Application::main();
Copy after login

Api\User.php

<?php
namespace Api;

use Service\Login;
class User{
  public function __construct(){
    echo "User类<br/>";
    new Login();
    new Account();
  }
}
Copy after login

Api\Account.php

<?php
namespace Api;

class Account{
  public function __construct(){
    echo "Account类<br/>";
  }
}
Copy after login

Service\Login.php

<?php
namespace Service;

class Login{
  public function __construct(){
    echo "Login类<br/>";
  }
}
Copy after login

Service\User.php

<?php
namespace Service;

class User{
  public function __construct(){
    echo "Service下的User类<br/>";
  }
}
Copy after login

结果:

 

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PHP自动加载autoload和命名空间方法小结

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