获取URL文件名后缀

<?php
$url = "http://www.abc.com/abc/de/fg.php?id=1";

//这个是自己写的
function getUrl($url) {
$date = explode('?', $url);
$date = basename($date[0]);
$date = explode('.', $date);
return $date[1];
}

var_dump(getUrl($url));

//下面两个是网上弄的
function getExt($url){
$arr = parse_url($url);

$file = basename($arr['path']);
$ext = explode(".",$file);
return $ext[1];
}

var_dump(getExt($url));

function getName($url) {

$w_param = pathinfo($url);

$str = $w_param['extension'];

list($type, $vars) = explode('?',$str);

return $type;

}
echo 'start3'.date("Y-m-d H:i:s");
?>