php url字符串截取路径的文件名和扩展名

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

 

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