php中的get_headers() 函数可以响应动静头部信息，可以用于收罗时对页面状态的判定。
手册中的例子：
<?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 ) */ ?> 只表明第2组功效（和还会呈现的功效），[0] => HTTP/1.1 200 OK 200的状态是乐成发送请求。其它状态还会有301、404等等
[Date] => Sat, 29 May 2004 12:28:14 GMT 日期，详细哪 个时区不思量
[Server] => Apache/1.3.27 (Unix) (Red-Hat/Linux) 处事器和版本不表明，你懂的
[Last-Modified] => Wed, 08 Jan 2003 23:11:55 GMT 最后更新
[Accept-Ranges] => bytes [Content-Length] => 438 字节数
[Content-Type] => 'text/html ;charset=UTF-8', html语言，字符集为utf-8
[X-Powered-By]=> 'PHP/5.2.17', 支持语言和版本
[Location] => 'http://enenba.com/admin/', 跳转位置，一般有301才会呈现。也就是实现的会见解点