我有a plugin user bookmarks - see here - 我正在尝试为它添加一个书签，这样书签帖子就不会疯狂地堆积起来。我该怎么做？这是显示书签帖子的功能。

function upb_list_bookmarks( $delete_link = true, $delete_text = \'Delete\' ) {
if(is_user_logged_in()) {
    $display = \'<ul class="upb-bookmarks-list" style="margin-left:0px;">\';
        $bookmarks = upb_get_user_meta(upb_get_user_id());
        if($bookmarks) {
            foreach( $bookmarks as $bookmark) {
                $display .= \'<li class="upb_bookmark bookmark-\' . $bookmark . \'" style="float: left; width: 200px; list-style-type: none; margin-top: 0px; margin-bottom:22px; margin-right: 25px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 35px; padding-left: 0px; background-repeat: no-repeat;" >\';
                $display .= \'<div class="sjena" style="display:inline-block; width:200px; height:200px; clear:both; margin-right:25px; margin-bottom:-33px;">\';
                $display .= \'<div class="item_lists_thumbnail" >\';
                $display .= \'<span class="thumbs for-image" >\';
                $display .= \'<a href="\' . get_permalink($bookmark) . \'">\';
                    $display .= \'<img style="width:200px; height:150px;" src="\' . get_post_meta($bookmark, \'_post_thumbnail\', true) . \'" alt=""  />\';
                    $display .= \'<span class="title">\';
                    $display .= \'<p>\';                      
                    $display .=  limit_text(get_the_title($bookmark), 25);                     
                    $display .= \'</p>\';
                    $display .= \'</span>\';
                    $display .= \'</a>\'; 
                    $display .= \'</span>\';
                    $display .= \'<div class="item_lists_meta" style="background:#FFF; height:190px;"></div>\';
                    $display .= \'<div id="bookmark_minus"></div>\';
                        if($delete_link) {
                        $display .= \'<a style="position:absolute; margin-top:-27px; margin-left:24px; font-family: Terminal Dosis; font-weight: 500; text-transform:uppercase; font-size:10px;" href="#" class="upb_del_bookmark upb_del_bookmark_\' . $bookmark . \'" rel="\' . $bookmark . \'" title="\' . __(\'Remove this Bookmark\') . \'">\' . \'remove\' . \'</a>\' ;
                    }
                    $display .= \'</div>\';                       
                $display .= \'</div>\';
            $display .= \'</li>\';
            }
        } else {
            $display .= \'<li class="bookmark-link no-bookmarks">You do not have any favorited looks :(</li>\';
        }
    $display .= \'</ul>\';
}
else {
    $display .= \'You must be logged in to view your bookmarks.\';
}

return $display;
}