入口文件index.php文件中的这个是不是有点多余

www下的index.php中有
$site_url = strtolower('http://'.$_SERVER['HTTP_HOST'].substr($_SERVER['PHP_SELF'], 0, strrpos($_SERVER['PHP_SELF'], '/index.php')).'/shop/index.php');

//@header('Location: '.$site_url);

include('shop/index.php');

其中把$site_url = strtolower('http://'.$_SERVER['HTTP_HOST'].substr($_SERVER['PHP_SELF'], 0, strrpos($_SERVER['PHP_SELF'], '/index.php')).'/shop/index.php');去掉也没有啥变化，这句是不是有点多余呢？