get_headers — 取得服务器响应一个 HTTP 请求所发送的所有标头。

$url ='http://www.youkud.com';
print_r(get_headers($url));
print_r(get_headers($url, 1));

以上例程的输出类似于：

Array

(

   [0] => HTTP/1.1 200 OK

   [1] =>Date: Sat, 29 May 2004 12:28:13 GMT

   [2] => Server: Apache/1.3.27 (Unix)  (Red-Hat/Linux)

   [3] => Last-Modified: Wed, 08 Jan 2003 23:11:55 GMT

   [4] => ETag:"3f80f-1b6-3e1cb03b"

   [5] => Accept-Ranges: bytes

   [6] => Content-Length: 438

   [7] => Connection: close

   [8] => Content-Type: text/html

)

Array

(

   [0] => HTTP/1.1 200 OK

   [Date] => Sat, 29 May 2004 12:28:14 GMT

   [Server] => Apache/1.3.27 (Unix)  (Red-Hat/Linux)

   [Last-Modified] => Wed, 08 Jan 2003 23:11:55 GMT

   [ETag] =>"3f80f-1b6-3e1cb03b"

   [Accept-Ranges] => bytes

   [Content-Length] => 438

   [Connection] => close

   [Content-Type] => text/html

)