Wordpres add meta box within duplicate image fields

这段代码可以实现在 meta box 里加入一个图片组（使用wordpress uploader）上传图片。
 
<?php
function xxxx_repeat_image_fileds($cnt, $p = null) {
    if ($p === null) {
        $a =  '';
        $existing_image = '';
    } else {
        $a = $p['n'];
        $existing_image = '<img src="' . $a . '" width="100" />';
    }
    return <<<HTML
            <div><div class="existing_image">$existing_image</div><input type="text" class="xxxx_image" id="xxxx_image_$cnt" name="xxxx_image[$cnt][n]" size="10" value="$a"><span class="remove">Remove</span><hr></div>
HTML;
}

function xxxx_render_image_attachment_box($post) {
    global $post;
    $xxxx_image_data = get_post_meta($post->ID, "xxxx_image", true);
    echo '<div id="xxxx_image_items">';
    $c = 0;
    if (count($xxxx_image_data) > 0) {
        foreach ((array) $xxxx_image_data as $p) {
            if (isset($p['n'])) {
                echo xxxx_repeat_image_fileds($c, $p);
                $c = $c + 1;
            }
        }
    }
    echo '</div>';

    ?>
    <span id="here"></span>
    <span class="add"><?php echo __('Add Image'); ?></span>

    <script>
        var $ =jQuery.noConflict();
        jQuery(document).ready(function($) {

            var count = <?php echo $c; ?>;
            $(".add").click(function() {
                count = count + 1;
                //$('#price_items').append('<li><label>Nr :</label><input type="text" name="price_data[' + count + '][n]" size="10" value=""/><label>Description :</label><input type="text" name="price_data[' + count + '][d]" size="50" value=""/><label>Price :</label><input type="text" name="price_data[' + count + '][p]" size="20" value=""/><span class="remove">Remove</span></li>');
                $('#xxxx_image_items').append('<?php echo implode('', explode("\n\r", xxxx_repeat_image_fileds('count'))); ?>'.replace(/count/g, count));
                return false;
            });
            $(".remove").live('click', function() {
                $(this).parent().remove();
            });

                $('#xxxx_image_items input').live("click",function(){

                                formfield = $(this).attr('name');
                                field_id = $(this).attr('id');
                                //alert(field_id);
                                tb_show('', 'media-upload.php?type=image&amp;TB_iframe=true');
                                return false;
                });
                window.send_to_editor = function(html) {
                    imgurl = $('img',html).attr('src');
                    $("#"+field_id).val(imgurl);
                    tb_remove();
                }
        });
    </script>
    <style> 
        .existing_image{float:left; margin:10px; width:100px;}
        .xxxx_image { width:50%;}
        #xxxx_image_items hr {border:none; border-bottom:1px dashed #ccc; clear:both; margin: 10px;}
    </style>
    <?php
}

function xxxx_admin_scripts() {
    wp_enqueue_script('media-upload');
    wp_enqueue_script('thickbox');
    wp_enqueue_script('my-upload');
}

function xxxx_admin_styles() {
    wp_enqueue_style('thickbox');
}

function xxxx_setup_meta_boxes() {
// Add the box to a particular custom content type page
    add_action('admin_print_scripts', 'xxxx_admin_scripts');
    add_action('admin_print_styles', 'xxxx_admin_styles');
    add_meta_box('xxxx_image_box', 'Background Image', 'xxxx_render_image_attachment_box', 'page', 'normal', 'high');
}

add_action('admin_init', 'xxxx_setup_meta_boxes');

function xxxx_update_post($post_id) {

            //global $post;
            // to prevent metadata or custom fields from disappearing... 
                if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE)
                    return $post_id;
            // OK, we're authenticated: we need to find and save the data
                if (isset($_POST['xxxx_image'])) {
                    $data = $_POST['xxxx_image'];
                    update_post_meta($post_id, 'xxxx_image', $data);
                } 
}

add_action('save_post', 'xxxx_update_post');