spl_autoload_register类的自动加载

autoload.php

<?php
    function import($classname)
    {
        $filename = __DIR__.'/class/'.$classname.'.php';
        if(is_file($filename))
        {
            require $filename;
        }else {
            die('Not Find the file '.$filename);
        }
    }
    spl_autoload_register('import');