phpcms v9中专题用的面包屑导航怎么写哟

<br />function catpos($catid, $symbol=' > '){<br />	$category_arr = array();<br />	$siteids = getcache('category_content','commons');<br />	$siteid = $siteids[$catid];<br />	$category_arr = getcache('category_content_'.$siteid,'commons');<br />	if(!isset($category_arr[$catid])) {<br />		$db = pc_base::load_model('module_model');<br />		$info = $db->get_one('`module`=\''.$_GET['m'].'\'');<br />		return $info['name'].'  ';<br />	}<br />	$pos = '';<br />	$siteurl = siteurl($category_arr[$catid]['siteid']);<br />	$arrparentid = array_filter(explode(',', $category_arr[$catid]['arrparentid'].','.$catid));<br />	foreach($arrparentid as $catid) {<br />		$url = $category_arr[$catid]['url'];<br />		if(strpos($url, '://') === false) $url = $siteurl.$url;<br />		$pos .= '<a href="'.$url.'">'.$category_arr[$catid]['catname'].'</a>'.$symbol;<br />	}<br />	return $pos;<br />}<br />