How to simply implement php automatic loading

下面就为大家带来一篇PHP 自动加载的简单实现(推荐)。觉得挺不错的，现在就分享给大家，也给大家做个参考。一起过来看看吧

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();

Api\User.php

<?php
namespace Api;

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

Api\Account.php

<?php
namespace Api;

class Account{
  public function construct(){
    echo "Account类<br/>";
  }
}

Service\Login.php

<?php
namespace Service;

class Login{
  public function construct(){
    echo "Login类<br/>";
  }
}

Service\User.php

<?php
namespace Service;

class User{
  public function construct(){
    echo "Service下的User类<br/>";
  }
}

结果：

 

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