Function code for batch modifying file suffix names in PHP

The code is as follows:

<?php 
function foreachDir($path){ 
$handle=opendir($path); 
if($handle){ 
while (false !== ($file = readdir($handle))) { 
if($file!="." && $file!=&#39;..&#39;){ 
if(is_dir($path.$file)){ 
echo $path.$file."<br/>"; 
foreachDir($path.$file); 
}else{ 
echo "--".$path."/".$file."<br/>"; 
$ext = strripos($file,&#39;.&#39;); 
$aaa = substr($file,0,$ext); 
rename($path.&#39;/&#39;.$file,$path.&#39;/&#39;.$aaa.&#39;.JPG&#39;); 
// die(); 
} 
} 
} 
return false; 
} 
} 
foreachDir(&#39;D:\xampp\htdocs\TNF2&#39;);