如题，如果你在使用PHPCMS V9的时候需要在不同的站点之间调用推荐位可能会出现链接的URL为空的情况，具体解决办法如下，该办法适合20130522 之前版本 
一、在自定义函数中加入下面的函数： 

代码如下:
/** 
* 获取内容地址 
* @param $catid 栏目ID 
* @param $id 文章ID 
* @param $allurl 是否以绝对路径返回 
*/ 
function go_dusion($catid,$id, $allurl = 0) { 
static $category; 
if(empty($category)) { 
$siteids = getcache('category_content','commons'); 
$siteid = $siteids[$catid]; 
$category = getcache('category_content_'.$siteid,'commons'); 
} 
if($siteid == '' || empty($siteid)) { 
$siteids = getcache('category_content','commons'); 
$siteid = $siteids[$catid]; 
$category = getcache('category_content_'.$siteid,'commons'); 
} 
$id = intval($id); 
if(!$id || !isset($category[$catid])) return ''; 
$modelid = $category[$catid]['modelid']; 
if(!$modelid) return ''; 
$db = pc_base::load_model('content_model'); 
$db->set_model($modelid); 
$r = $db->get_one(array('id'=>$id), '`url`'); 
if (!empty($allurl)) { 
if (strpos($r['url'], '://')===false) { 
if (strpos($category[$catid]['url'], '://') === FALSE) { 
$site = siteinfo($category[$catid]['siteid']); 
$r['url'] = substr($site['domain'], 0, -1).$r['url']; 
} else { 
$r['url'] = $category[$catid]['url'].$r['url']; 
} 
} 
} 

return $r['url']; 
} 
第二：在content/classes/content_tag.class.php 的 public function position($data)函数中 

代码如下:
/** 
* 推荐位 
* @param $data 
*/ 
public function position($data) { 
$sql = ''; 
$array = array(); 
$posid = intval($data['posid']); 
$order = $data['order']; 
$thumb = (empty($data['thumb']) || intval($data['thumb']) == 0) ? 0 : 1; 
//Du修改 
if(isset($data['siteid']) && is_numeric($data['siteid'])){ 
$siteid = $data['siteid']; 
}else{ 
$siteid = $GLOBALS['siteid'] ? $GLOBALS['siteid'] : 1; 
} 
$catid = (empty($data['catid']) || $data['catid'] == 0) ? '' : intval($data['catid']); 
if($catid) { 
$siteids = getcache('category_content','commons'); 
if(!$siteids[$catid]) return false; 
$siteid = $siteids[$catid]; 
$this->category = getcache('category_content_'.$siteid,'commons'); 
} 
if($catid && $this->category[$catid]['child']) { 
$catids_str = $this->category[$catid]['arrchildid']; 
$pos = strpos($catids_str,',')+1; 
$catids_str = substr($catids_str, $pos); 
$sql = "`catid` IN ($catids_str) AND "; 
} elseif($catid && !$this->category[$catid]['child']) { 
$sql = "`catid` = '$catid' AND "; 
} 
if($thumb) $sql .= "`thumb` = '1' AND "; 
if(isset($data['where'])) $sql .= $data['where'].' AND '; 
if(isset($data['expiration']) && $data['expiration']==1) $sql .= '(`expiration` >= \''.SYS_TIME.'\' OR `expiration` = \'0\' ) AND '; 
$sql .= "`posid` = '$posid' AND `siteid` = '".$siteid."'"; 
$pos_arr = $this->position->select($sql, '*', $data['limit'],$order); 
if(!empty($pos_arr)) { 
foreach ($pos_arr as $info) { 
$key = $info['catid'].'-'.$info['id']; 
$array[$key] = string2array($info['data']); 
$array[$key]['url'] = go_dusion($info['catid'],$info['id']); 
$array[$key]['id'] = $info['id']; 
$array[$key]['catid'] = $info['catid']; 
$array[$key]['listorder'] = $info['listorder']; 
} 
} 
return $array; 
} 
即可，注意看两处红色区域，11-16行是为了获取siteID 可以根据情况不修改也可以 
42行，即将原来 的go 改为 go_dusion其它不变即可。

来源：互联网
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