使用cURL获取HTTP标头并保存到变量

时间:2011-11-22 15:25:11

标签: php curl http-headers

我使用它来获取XML提要和HTTP标头

// Initiate the curl session
$ch = curl_init();

// Set the URL
curl_setopt($ch, CURLOPT_URL, $url);

// Allow the headers
curl_setopt($ch, CURLOPT_HEADER, true);

// Return the output instead of displaying it directly
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

// Execute the curl session
$output = curl_exec($ch);

// Close the curl session
curl_close($ch);

// Cache feed
file_put_contents($filename, $output);

// XML to object
$output = simplexml_load_string($output);

// Return the output as an array
return $output;

并返回这些标题

HTTP/1.1 200 OK
Cache-Control: public, max-age=30
Content-Length: 5678
Content-Type: text/xml
Expires: Tue, 22 Nov 2011 15:12:16 GMT
Last-Modified: Tue, 22 Nov 2011 15:11:46 GMT
Vary: *
Server: Microsoft-IIS/7.0
Set-Cookie: ASP.NET_SessionId=1pfijrmsqndn5ws3124csmhe; path=/; HttpOnly
Data-Last-Updated: 11/22/2011 15:11:45
X-AspNet-Version: 4.0.30319
X-Powered-By: ASP.NET
Date: Tue, 22 Nov 2011 15:11:46 GMT

我只希望它返回HTTP标头的一部分,即

Expires: Tue, 22 Nov 2011 15:12:16 GMT

并将其保存到变量中,我该怎么做?我一直在浏览PHP手册,但无法解决它

2 个答案:

答案 0 :(得分:3)

preg_match('~^(Expires:.+?)$~ism', $headers, $result);

return $result[1];

答案 1 :(得分:2)

您可以使用PHP的get_headers($ url,1)函数,该函数返回数组中的所有头信息,如果将第二个可选参数设置为1(非零),则将其解析为关联数组像:

array(
    [...] => ...,
    [Expires] => 'what you need',
    [...] => ...
) 

http://php.net/manual/en/function.get-headers.php