Wordpress Media Library の画像をメタ情報とともに表示する方法

gistfile1.php

<!-- Refs: http://wordpress.org/support/topic/get-title-alt-or-caption-from-media-library-and-insert-into-theme -->
<?php
  $args = array( 'post_type' => 'attachment', 'orderby' => 'menu_order', 'order' => 'ASC', 'post_mime_type' => 'image' ,'post_status' => null, 'numberposts' => null, 'post_parent' => $post->ID );

  $attachments = get_posts($args);
  if ($attachments) {
    foreach ( $attachments as $attachment ) {
      $alt = get_post_meta($attachment->ID, '_wp_attachment_image_alt', true);
      $image_title = $attachment->post_title;
      $caption = $attachment->post_excerpt;
      $description = $image->post_content;
?>
<div>
<a href="<?php echo wp_get_attachment_url( $attachment->ID); ?>" rel="lightbox" title="<?php echo $image_title; ?>"><img src="<?php echo wp_get_attachment_url( $attachment->ID , false ); ?>" alt="<?php echo $alt; ?>" width="75" height="75" border="0" /></a>
<span>alt: <?php $alt?></span>
<span>image_title: <?php echo $image_title?></span>
<span>caption: <?php echo $caption?></span>
<span>description: <?php echo $description?></span>
</div>
<?php
    }
  } 
?>