PHP gets the filename and extension of the url string interception path

PHP gets the file name

 
function retrieve($url) 
{ 
preg_match('//([^/]+.[a-z]+)[^/]*$/',$url,$match); 
return $match[1]; 
} 

PHP gets the file extension

 
<?php 
function getExt($url) 
{ 
$path=parse_url($url); 
$str=explode('.',$path['path']); 
return $str[1]; 
} 
echo getExt('http://tools.jb51.net/abc/de/fg.php?id=1'); 
?>