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public function getNetLink(){ header("cache-control:no-cache,must-revalidate"); header("Content-Type:text/html;charset=utf-8"); if (!$file){ $shownetlink = "<font color=\"red\">网络连接失败</font>"; }else{ $shownetlink = "<font color=\"#06C\">网络连接正常</font>"; } echo $shownetlink; }