PHP【URL扩展截取】

从给定的URL中截取扩展名

$url = 'http://www.sina.com.cn/abc/de/fg.php?id=1&a=123';
function getExt($url){
    $p = parse_url($url);
    return pathinfo($p['path'], PATHINFO_EXTENSION);
}
echo getExt($url);