php获取网页header信息的4种方法

php获取网页header信息的方法多种多样,就php语言来说,我知道的方法有4种, 下面逐一献上。

方法一:使用get_headers()函数

推荐指数: ★★★★★

get_header方法最简单只要两行代码即可搞定。如下:

  1. $thisurl = "http://www.lao8.org/";
  2. print_r(get_headers($thisurl, 1));

得到的结果为:

  1. Array
  2. (
  3. [0] => HTTP/1.1 200 OK
  4. [Cache-Control] => max-age=86400
  5. [Content-Length] => 76102
  6. [Content-Type] => text/html
  7. [Content-Location] => http://www.lao8.org/index.html
  8. [Last-Modified] => Fri, 19 Jul 2013 03:52:30 GMT
  9. [Accept-Ranges] => bytes
  10. [ETag] => "50bc48643384ce1:5cb3"
  11. [Server] => Microsoft-IIS/6.0
  12. [X-Powered-By] => ASP.NET
  13. [Date] => Fri, 19 Jul 2013 09:06:39 GMT
  14. [Connection] => close
  15. )

方法二:使用http_response_header

推荐指数: ★★★

http_response_headerf方法也很简单,仅三行:

  1. $thisurl = "http://www.lao8.org";
  2. $html = file_get_contents($thisurl );
  3. print_r($http_response_header);

得到的结果为:

  1. Array
  2. (
  3. [0] => HTTP/1.1 200 OK
  4. [1] => Cache-Control: max-age=86400
  5. [2] => Content-Length: 76102
  6. [3] => Content-Type: text/html
  7. [4] => Content-Location: http://www.lao8.org/index.html
  8. [5] => Last-Modified: Fri, 19 Jul 2013 03:52:30 GMT
  9. [6] => Accept-Ranges: bytes
  10. [7] => ETag: "50bc48643384ce1:5cb3"
  11. [8] => Server: Microsoft-IIS/6.0
  12. [9] => X-Powered-By: ASP.NET
  13. [10] => Date: Fri, 19 Jul 2013 09:06:41 GMT
  14. [11] => Connection: close
  15. )

方法三:使用stream_get_meta_data()函数

推荐指数: ★★★

使用stream_get_meta_data()代码也只需三行:

  1. $thisurl = "http://www.lao8.org/";
  2. $fp = fopen($thisurl, 'r');
  3. print_r(stream_get_meta_data($fp));

得到的结果为:

  1. Array
  2. (
  3. [wrapper_data] => Array
  4. (
  5. [0] => HTTP/1.1 200 OK
  6. [1] => Cache-Control: max-age=86400
  7. [2] => Content-Length: 76102
  8. [3] => Content-Type: text/html
  9. [4] => Content-Location: http://www.lao8.org/index.html
  10. [5] => Last-Modified: Fri, 19 Jul 2013 03:52:30 GMT
  11. [6] => Accept-Ranges: bytes
  12. [7] => ETag: "50bc48643384ce1:5cb3"
  13. [8] => Server: Microsoft-IIS/6.0
  14. [9] => X-Powered-By: ASP.NET
  15. [10] => Date: Fri, 19 Jul 2013 09:06:41 GMT
  16. [11] => Connection: close
  17. )
  18. [wrapper_type] => http
  19. [stream_type] => tcp_socket
  20. [mode] => r+
  21. [unread_bytes] => 1086
  22. [seekable] =>
  23. [uri] => http://www.lao8.org/
  24. [timed_out] =>
  25. [blocked] => 1
  26. [eof] =>
  27. )

第四种方法: 使用php的高级函数 CURL()来获取

推荐指数: ★★★★

上面的三种方法能获取一般的网页header信息,如果想要获取更详细的header信息比如网页是否启用了GZip压缩。这时候可以用php的高级函数curl()来获取。

使用curl获得header可以检测GZip压缩
先贴出代码:

  1. <?php
  2. $szUrl = 'http://www.lao8.org/';
  3. $curl = curl_init();
  4. curl_setopt($curl, CURLOPT_URL, $szUrl);
  5. curl_setopt($curl, CURLOPT_HEADER, 1);  //输出header信息
  6. curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);  //不显示网页内容
  7. curl_setopt($curl, CURLOPT_ENCODING, ''); //允许执行gzip
  8. $data=curl_exec($curl);
  9. if(!curl_errno($curl))
  10. {
  11. $info = curl_getinfo($curl);
  12. $httpHeaderSize = $info['header_size'];  //header字符串体积
  13. $pHeader = substr($data, 0, $httpHeaderSize); //获得header字符串
  14. $split   = array("rn", "n", "r");  //需要格式化header字符串
  15. $pHeader = str_replace($split, '<br>', $pHeader); //使用<br>换行符格式化输出到网页上
  16. echo $pHeader;
  17. }
  18. ?>

输出结果如下:

  1. HTTP/1.1 200 OK
  2. Cache-Control: max-age=86400
  3. Content-Length: 15189
  4. Content-Type: text/html
  5. Content-Encoding: gzip
  6. Content-Location: http://www.lao8.org/index.html
  7. Last-Modified: Fri, 19 Jul 2013 03:52:28 GMT
  8. Accept-Ranges: bytes
  9. ETag: "0268633384ce1:5cb3"
  10. Vary: Accept-Encoding
  11. Server: Microsoft-IIS/6.0
  12. X-Powered-By: ASP.NET
  13. Date: Fri, 19 Jul 2013 09:27:21 GMT

可以看到使用curl获取到的header信息多了这行:Content-Encoding: gzip,网页启用了GZip压缩。

上一篇:Python字典实现三级菜单


下一篇:SQL Server 请求失败或服务未及时响应。有关详细信息,请参见事件日志或其它适合的错误日志