Symfony timthumb generator helper

TimthumbHelper.php

<?php

/**
 * Timthumb Helper
 * Helper para geração de thumbnails com o timthumb
 *
 * @see http://www.binarymoon.co.uk/projects/timthumb/
 * @author Eduardo Marcolino <eduardo.marcolino@gmail.com>
 * 
 * @param source $image url to image
 * @param width $width the width to resize to
 * @param height $height the height to resize to
 * @param type $quality 0 - 100
 * @param type $alignment c, t, l, r, b, tl, tr, bl, br
 * @param type $zoom_crop 0, 1, 2, 3
 * @return timthumb image 
 */

function timthumb($image, $width = 0, $height = 0, $quality = 100, $alignment = 'c', $zoom_crop = 0) 
{
  $params = array(
      'w='.$width,
      'h='.$height,
      'q='.$quality,
      'src='.$image,
      'a='.$alignment,
      'zc='.$zoom_crop
  );
  return image_tag(_compute_public_path('/timthumb.php','','php',true).'?'.join('&',$params));
}
?>