post title as caption thumbnails

// 05 jan 2013 alchymyth
// show thumbnail with post title as 'caption', wrapped with '.wp-caption thumb-caption' div;

add_filter('post_thumbnail_html','add_post_thumbnail_post_title_as_caption',10,5);

function add_post_thumbnail_post_title_as_caption($html, $post_id,
$post_thumbnail_id, $size, $attr) {

 if( $html == '' ) {

        return $html;

 } else {

        $out = '';
  global $post;
  $thumbnail_image = get_posts(array('p' => $post_thumbnail_id,
'post_type' => 'attachment'));

  if ($thumbnail_image && isset($thumbnail_image[0])) {

  $image = wp_get_attachment_image_src($post_thumbnail_id, $size);
  $t_width = $image[1] +0; // +0 here for no extra padding, needs to be considered in writing css - the default image caption uses +10;
  $class = $attr['class'];
     $out .= '<div
class="wp-caption thumb-caption '.$class.'"
style="width:'.$t_width.'px; ">';

        $out .= $html;

        $out .= '<p
class="wp-caption-text">'.apply_filters('the_title',$post->post_title).'</p></div>';
  }
 return $out;
 }
}