<?php
/**
 * Retrieve the list of images attached to the same post that the current attachment.
 *
 * @author Mehdi Kabab <http://pioupioum.fr>
 * @copyright Copyright (C) 2009 Mehdi Kabab
 * @license http://www.gnu.org/licenses/gpl.html  GNU GPL version 3 or later
 *
 * @link http://www.webinventif.fr/wordpress-afficher-toutes-miniatures-liees-article-pages-media/ Inspiration
 *
 * @param  string $output Optional. Constant for return type, either OBJECT (default), ARRAY_A, ARRAY_N.
 * @return array|bool False on failure
 **/
function get_other_attachments($output = OBJECT)
{
    global $post;
    if (!is_attachment() || false === (bool) $post->post_parent)
        return false;
 
    $attachments = get_children(array(
        'post_type'      => 'attachment',
        'post_mime_type' => 'image',
        'post_status'    => 'inherit',
        'post_parent'    => $post->post_parent
    ), $output);
 
    return $attachments;
}
 
/**
 * Display the HTML list of images attached to the same post that the current attachment.
 *
 * Only works on an attachment page.
 *
 * @author Mehdi Kabab <http://pioupioum.fr>
 * @copyright Copyright (C) 2009 Mehdi Kabab
 * @license http://www.gnu.org/licenses/gpl.html  GNU GPL version 3 or later
 *
 * @link http://www.webinventif.fr/wordpress-afficher-toutes-miniatures-liees-article-pages-media/ Inspiration
 *
 * @param  string|array $args Optional. User defined arguments for replacing the defaults.
 * @return bool False on failure.
 */
function wallthumb($args = array())
{
    global $post;
    $attachments = get_other_attachments();
    if (!$attachments)
        return false;
 
    $defaults = array(
        'id'            => 'gallery-%d',
        'current_class' => 'current',
        'thumb_class'   => 'gallerythumb',
        'before_thumb'  => '<li class="%s">',
        'after_thumb'   => '</li>',
        'before_list'   => '<ul id="%s">',
        'after_list'    => '</ul>',
    );
    $args        = wp_parse_args($args, $defaults);
    $current_id  = $post->ID;
    $thumb_class = trim($args['thumb_class']);
 
    static $i = 0;
    $stack = array(sprintf($args['before_list'], sprintf($args['id'], ++$i)));
    foreach ($attachments as $attachment)
    {
        if ($current_id != $attachment->ID)
        {
            $buf = sprintf($args['before_thumb'], $thumb_class);
        }
        else
        {
            $buf = sprintf($args['before_thumb'], trim($thumb_class . ' ' . $args['current_class']));
        }
        $buf .= sprintf('<a href="%s" title="%s" rel="attachment">%s</a>',
            get_attachment_link($attachment->ID),
            esc_attr(get_the_title($attachment->ID)),
            wp_get_attachment_image($attachment->ID, 'thumbnail')
        );
        $buf .= $args['after_thumb'];
        $stack[] = $buf;
    }
    echo implode("\n\t", $stack) . "\n{$args['after_list']}";
}