Recursive search for files using PHP iterator

search.php

<?php

search_files('/home/gabi/test/', '.png');

function search_files($dir, $extension) {
  $extension_length = strlen($extension);
  $rit = new RecursiveDirectoryIterator($dir);
  foreach(new RecursiveIteratorIterator($rit) as $file) {
    if(strcasecmp(substr($file, -$extension_length), $extension) == 0) {
      echo "$file\n";
    }
  }
}