php获取后缀名

<?php 
//当前页面用这个
$url = $_SERVER['PHP_SELF'];
//其它页面用这个
$url ="http://www.baidu.com/index.php";
echo substr($url,strrpos($url,"."))."<br/>";
?>

 

<?php
$path = parse_url('http://www.baidu.com/index.php');
$path = explode("/",$path['path']);
echo $path[count($path) - 1];
?>