类的自动加载器

自动加载器 autoloader.php

spl_autoload_register(function($class){
    require $class. '.php';
});

a.php

namespace zuoye\controller;
class a
{
    public static function index()
    {
        return __METHOD__;
    }

b.php

namespace zuoye\controller;
class b
{
    public static function index()
    {
        return __METHOD__;
    }

c.php

namespace zuoye\controller;
class c
{
    public static function index()
    {
        return __METHOD__;
    }

入口文件 zuoye.php

namespace zuoye;
require __DIR__ . '/controller/a.php';
require __DIR__ . '/controller/b.php';
require __DIR__ . '/controller/c.php';
echo controller\a::index().'<br>';
echo controller\b::index().'<br>';
echo controller\c::index().'<br>';