<?php if ($_GET['category'] != $val['category_id'] AND $val['category_info']['title']) { ?><span class="aw-question-tags"> <a href="home/explore/category-<?php echo $val['category_info']['url_token']; ?>"><?php echo $val['category_info']['title']; ?></a> </span> • <?php } ?>想在问题页面调用问题的category,应该怎么调用呢?