PHP中get_headers函数使用方法解析

get_headers() 是PHP系统级函数,他返回一个包含有服务器响应一个 HTTP
请求所发送的标头的数组。如果失败则返回 FALSE 并发出一条 E_WARNING
级别的错误信息(可用来判断远程文件是否存在)。

get_headers() 是PHP系统级函数,他返回一个包含有服务器响应一个 HTTP
请求所发送的标头的数组。如果失败则返回 FALSE 并发出一条 E_WARNING
级别的错误信息。

返回值

函数定义

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

url 目标 URL

url:目标 URL。

在PHP开发中,我们经常需要获取HTTP请求中发送的服务器信息,本文通过一个简单的PHP示例介绍了通过get_headers函数获取服务器的相关信息。

Array( [0] => HTTP/1.1 200 OK [1] => Date: Sat, 29 May
2004 12:28:13 GMT [2] => Server: Apache/1.3.27 [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)

参数

参数

url 目标 URL

format 如果将可选的 format 参数设为 1,则 get_headers()
会解析相应的信息并设定数组的键名。

示例

<?php
$url='http://www.phpernote.com';
print_r(get_headers($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
)

以上例程的输出类似于:

[X-Varnish] => 2893360335 [Age] => 0 [Via] => 1.1 varnish
[Connection] => Array ( [0] => close [1] => Close ))

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

复制代码 代码如下:Array( [0] =>
HTTP/1.1 302 Moved Temporarily [Location] =>
[Content-Type] => Array ( [0] => text/html;charset=UTF-8 [1]
=> text/html;charset=utf-8 )

参数

Array( [0] => HTTP/1.1 200 OK [Date] => Sat, 29 May 2004
12:28:14 GMT [Server] => Apache/1.3.27 [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)

format 如果将可选的 format 参数设为 1,则 get_headers()
会解析相应的信息并设定数组的键名。

//输出跳转到的网址echo $headers[‘Location’];