Unire tanti piccoli files

[kaworuskench]

$dir="cartella/che/contiene/i/file/"


if (is_dir($dir)) {
   if ($dh = opendir($dir)) {
      $stringa="";
      while (($file = readdir($dh)) !== false) {
             if($file!="." && $file!="..")
             {
                 $stringa.=implode("", file($file));
             }
       }
       closedir($dh);
   }
}
$stream=fopen("filenuovo.txt", "w+");
fwrite ($stream, $stringa);
fclose($stream);