自动加载函数__autoload

//自动化引用类
function mvc__autoload($className){
    //判断文件是否存在
    if(file_exists("./models/{$className}.class.php")){
        require "./models/{$className}.class.php";
//        echo "./models/{$className}.class.php";
    }elseif(file_exists("./controllers/{$className}.class.php")) {
        require "./controllers/{$className}.class.php";
//        echo $className;

    }else{
        echo 404;
    }
}


//引入smarty类
require './libs/Smarty.class.php';
spl_autoload_register('mvc__autoload');//写入注册表