php遍历目录viewDir函数

<?php 
/** 
* 遍历目录,找出目录下某个后缀名的所有文件 
* */ 
function viewDir ($directory, $ext) { 
if (is_dir($directory)) { 
$handle = opendir($directory); 
while ($file = readdir($handle)){ 
$subdir = $directory . '/' .$file; 
if ($file != '.' && $file !='..' && is_dir($subdir)){ 
viewDir($subdir,$ext); 
} else if( $file != '.' && $file != '..') { 
$fileInfo = pathinfo($subdir); 
$fileExt = $fileInfo['extension']; 
if ($fileExt == $ext){ 
echo $directory.'/'.$file.'<br />'; 
} 
} 
} 
closedir($handle); 
} 
} 
viewDir('E:\www\test','php'); 
?>