PHP BUDDY

$dir = "img1";
$fileType = "jpg";
$charsToTrim = 4;
if($handle = opendir($dir))
{
    $count = 1;
    while (false !== ($file = readdir($handle))) 
   {
    if(is_file($dir."\\".$file))
    {
        $extension = substr(strrchr($file,"."),1);
        if(strcasecmp($fileType,$extension) == 0)
        {
           // $newName = substr($file,$count); 
      $newName = $count;
            $success = rename($dir."\\".$file, $dir."\\".$newName.'.'.$extension); 
            if($success)
            {
                echo $file." renamed to ".$newName;
                echo "
";
                $count++;
            }
            else
            {
                echo "Cannot rename ".$file. " to ".$newName."
";
                echo "
";
            }
        }
    }
   }
    echo $count." files renamed";
}
    closedir($handle);