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');
?>