get_headers()有可能返回与通过CURL获取它们不同的结果吗？这是我的代码：
header("Content-type: text/plain");
$url = 'http://www.foxbusiness.com/index.html';
echo "get_headers() headers:\n\n";
$headers = get_headers($url);
print_r($headers);
echo "\n\nCURL headers\n\n";
$curl = curl_init();
curl_setopt_array( $curl,array(
CURLOPT_HEADER => true,CURLOPT_NOBODY => true,CURLOPT_RETURNTRANSFER => true,CURLOPT_URL => $url ) );
$headers = explode( "\n",curl_exec( $curl ) );
curl_close( $curl );
print_r($headers);
这是结果：
get_headers() headers:
Array
(
[0] => HTTP/1.0 403 Forbidden
[1] => Server: AkamaiGHost
[2] => Mime-Version: 1.0
[3] => Content-Type: text/html
[4] => Content-Length: 283
[5] => Expires: Fri,31 Aug 2012 07:29:14 GMT
[6] => Date: Fri,31 Aug 2012 07:29:14 GMT
[7] => Connection: close
)
CURL headers
Array
(
[0] => HTTP/1.1 200 OK
[1] => Server: Apache
[2] => X-FoxNews-EdgeTTL: 2m
[3] => Content-Type: text/html;charset=UTF-8
[4] => Cache-Control: max-age=64
[5] => Date: Fri,31 Aug 2012 07:29:14 GMT
[6] => Connection: keep-alive
[7] =>
[8] =>
)
在配置cURL以执行HEAD请求时,get_headers将默认执行GET请求.首先,通过输入不同的
HTTP stream context
using HEAD for the request method.,使请求与cURL发送的请求相同
原文链接：https://www.f2er.com/php/136906.html此外,服务器似乎期望用户代理,因此请确保provide user_agent in php.ini或将其添加到流上下文.
以下应该有效：
stream_context_set_default(
array(
'http' => array(
'method' => 'HEAD','user_agent' => "PHP"
)
)
);
见http://codepad.viper-7.com/cOO9XS
请注意,stream_context_set_default修改了全局默认的Stream Context,因此在调用上述内容后,使用此流包装器对其他方法的任何调用现在都会执行HEAD请求.与例如file_get_contents不同,get_headers不允许通过函数的参数提供自定义流上下文.换句话说,确保在获得标题后将方法更改回GET.
