织梦软件频道如何判断是本站下载链接后再列出镜像？

if (strstr($firstLink, 'xxx.net')) //xiaoxin-20120818-判断是xxx.net域名下才出现镜像  { //xiaoxin-20120818-判断是xxx.net域名下才出现镜像  $firstLink = preg_replace("#http:\/\/([^\/]*)\/#i", '/', $firstLink);  foreach($sites as $site)  {  if(trim($site)=='') continue;  list($link,$serverName,$serverType) = explode('|', $site);  if (!empty($link_type) && $link_type != trim($serverType)) continue;  $link = trim( preg_replace("#\/$#", "", $link) ).$firstLink;  $downloads = getDownloads($link);  $uhash = substr(md5($link), 0, 24);  if($row['gotojump']==1)  {  $link = $phppath."/download.php?open=2&id={$refObj->ArcID}&uhash={$uhash}";  }  $temp = str_replace("~link~", $link, $tempStr);  $temp = str_replace("~server~", $serverName, $temp);  $temp = str_replace("~downloads~", $downloads, $temp);  $downlinks .= $temp;  }  } //xiaoxin-20120818-判断是xxx.net域名下才出现镜像