Function code for batch modifying file suffix names in PHP

The code is as follows:

"; 
foreachDir($path.$file); 
}else{ 
echo "--".$path."/".$file."
"; 
$ext = strripos($file,'.'); 
$aaa = substr($file,0,$ext); 
rename($path.'/'.$file,$path.'/'.$aaa.'.JPG'); 
// die(); 
} 
} 
} 
return false; 
} 
} 
foreachDir('D:\xampp\htdocs\TNF2');