为何getHeader函数总是超时，能否优化处理？

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1. [代码][PHP] 函数获取头信息phpfunction getHeaders($url, $timeout=2) { $ch=curl_init(); curl_setopt($ch, CURLOPT_URL, $url); curl_setopt($ch, CURLOPT_HEADER, true); curl_setopt($ch, CURLOPT_NOBODY, true); curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); curl_exec($ch); curl_close($ch);}

1.[代码][PHP]代码

function getHeaders($url,$timeout=2) { $ch=curl_init(); curl_setopt($ch,CURLOPT_URL,$url); curl_setopt($ch,CURLOPT_HEADER,true); curl_setopt($ch,CURLOPT_NOBODY,true); curl_setopt($ch,CURLOPT_RETURNTRANSFER,true); curl_setopt($ch,CURLOPT_TIMEOUT,$timeout); $data=curl_exec($ch); curl_close($ch); if(empty($data)) return false; $headers=explode("\n",$data); foreach ($headers as $key=>$headerLine){ if(strlen($headerLine)>1){ if(strpos($headerLine,':')!==false) $headers[stristr($headerLine,':',true)]=trim(stristr($headerLine,':'),': '); }else{ unset($headers[$key]); } } return $headers; }

2.[代码]返回值

Array ( [0] => HTTP/1.1 200 OK [1] => Server: NWS_UGC_HY [2] => Connection: keep-alive [3] => Date: Tue, 14 Jun 2016 13:27:28 GMT [4] => Cache-Control: max-age=600 [5] => Expires: Tue, 14 Jun 2016 13:37:28 GMT [6] => Last-Modified: Sun, 03 Aug 2014 22:52:31 GMT [7] => Content-Type: application/octet-stream [8] => Content-Length: 102752 [9] => X-Cache-Lookup: Hit From Disktank [Server] => NWS_UGC_HY [Connection] => keep-alive [Date] => Tue, 14 Jun 2016 13:27:28 GMT [Cache-Control] => max-age=600 [Expires] => Tue, 14 Jun 2016 13:37:28 GMT [Last-Modified] => Sun, 03 Aug 2014 22:52:31 GMT [Content-Type] => application/octet-stream [Content-Length] => 102752 [X-Cache-Lookup] => Hit From Disktank )