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 $output;
并返回这些标题
HTTP/1.1 200 OK
Cache-Control: public, max-age=30
Content-Length: 5678
Content-Type: text/xml
Expires: Tue, 22 Nov 2011 15:12:16 GMT
Last-Modified: Tue, 22 Nov 2011 15:11:46 GMT
Vary: *
Server: Microsoft-IIS/7.0
Set-Cookie: ASP.NET_SessionId=1pfijrmsqndn5ws3124csmhe; path=/; HttpOnly
Data-Last-Updated: 11/22/2011 15:11:45
X-AspNet-Version: 4.0.30319
X-Powered-By: ASP.NET
Date: Tue, 22 Nov 2011 15:11:46 GMT
我只希望它返回HTTP标头的一部分,即
Expires: Tue, 22 Nov 2011 15:12:16 GMT
并将其保存到变量中,我该怎么做?我一直在浏览PHP手册,但无法解决它
答案 0 :(得分:3)
preg_match('~^(Expires:.+?)$~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',
[...] => ...
)