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php中get_headers函数的作用及用法的详细介绍_PHP

WBOY
WBOYOriginal
2016-06-01 12:08:13773browse

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)。

函数定义

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

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

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

 

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