PHP 分隔URL各部分

<?php
$url = 'http://www.sina.com.cn/abc/de/fg.php?id=1&name=luhix';

function getExt($url){

	$arr = parse_url($url);

    /*
       Array
      (
        [scheme] => http
        [host] => www.sina.com.cn
        [path] => /abc/de/fg.php
        [query] => id=1&name=luhix
       )   
    */

	$file = basename($arr['path']);
    /*
      fg.php
    */
	$ext = explode('.',$file);
	return $ext[1];

}

echo getExt($url);

?>