Common类实现自动调用方法和注册方法

class Common
{
    public static function autoload($class_name)
{
    if (file_exists('../oop/day1/'.$class_name.'.class.php')){
        include '../oop/day1/'.$class_name.'.class.php';
    }else {
        echo '没有找到类文件:'.'\'../oop/day1/'.$class_name.'.class.php\'';
        return false;
    }
}
    public static function register()
    {
        spl_autoload_register('self::autoload');
    }
}

//调用
Common::register();