[PHP] 自动加载的实现

<?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('\\', '/', $class);
        $class="./".$class.".php";
        require_once $class;        
    }
}
Application::main();

<?php
namespace Api;

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

<?php
namespace Api;

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

<?php
namespace Service;

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

<?php
namespace Service;

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