PHP get_headers()函数详解

定义

get_headers - 取得服务器响应一个 HTTP 请求所发送的所有头信息

描述

get_headers ( string $url [, int $format = 0 [, resource $context ]] ) : array

如果将 format 参数设为 1，则 get_headers() 返回带键值的关联数组。

context 参数
A valid context resource created with stream_context_create().

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示例

<?php
  $url = 'http://www.example.com';
  print_r(get_headers($url));
  print_r(get_headers($url, 1));
?>

输出

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
)

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