例如:http://www.sina.com.cn/abc/de/fg.php?id=1需要去除php或.php
$url = 'http://www.sina.com.cn/abc/de/fg.php?id=1';
geturl($url);
function geturl($url){
$arr = parse_url($url);
$res = basename($arr['path']);
$ext = explode('.',$res);
var_dump($ext[1]);
}