在php语言中，header()这个函数很有用的，尤其在用到ajax时。
下面是header的一些详细讲解。
1 <?php
2 /**
3 * php header函数用法举例
4 * 整理：www.jbxue.com
5 */
6 // fix 404 pages:
7 header(\'HTTP/1.1 200 OK\');
8 // set 404 header:
9 header(\'HTTP/1.1 404 Not Found\');
10 // set Moved Permanently header (good for redrictions)
11 // use with location header
12 header(\'HTTP/1.1 301 Moved Permanently\');
13 // redirect to a new location:
14 header(\'Location: http://www.jbxue.com/\');
15 // redrict with delay:
16 header(\'Refresh: 10; url=http://www.jbxue.com/\');
17 print \'You will be redirected in 10 seconds\';
18 // you could also use the HTML syntax:// <meta http-equiv="refresh" content="10;http://www.jbxue.com/ />
19 // override X-Powered-By: PHP:
20 header(\'X-Powered-By: PHP/4.4.0\');
21 header(\'X-Powered-By: Brain/0.6b\');
22 // content language (en = English)
23 header(\'Content-language: en\');
24 // last modified (good for caching)
25 $time = time() – 60; // or filemtime($fn), etc
26 header(\'Last-Modified: \'.gmdate(\'D, d M Y H:i:s\', $time).\' GMT\');
27 // header for telling the browser that the content
28 // did not get changed
29 header(\'HTTP/1.1 304 Not Modified\');
30 // set content length (good for caching):
31 header(\'Content-Length: 1234\');
32 // Headers for an download:
33 header(\'Content-Type: application/octet-stream\');
34 header(\'Content-Disposition: attachment; filename="example.zip"\');
35 header(\'Content-Transfer-Encoding: binary\');
36 // load the file to send:readfile(\'example.zip\');
37 // Disable caching of the current document:
38 header(\'Cache-Control: no-cache, no-store, max-age=0, must-revalidate\');
39 header(\'Expires: Mon, 26 Jul 1997 05:00:00 GMT\');
40 // Date in the pastheader(\'Pragma: no-cache\');
41 // set content type:
42 header(\'Content-Type: text/html; charset=iso-8859-1\');
43 header(\'Content-Type: text/html; charset=utf-8\');
44 header(\'Content-Type: text/plain\');
45 // plain text file
46 header(\'Content-Type: image/jpeg\');
47 // JPG picture
48 header(\'Content-Type: application/zip\');
49 // ZIP file
50 header(\'Content-Type: application/pdf\');
51 // PDF file
52 header(\'Content-Type: audio/mpeg\');
53 // Audio MPEG (MP3,…) file
54 header(\'Content-Type: application/x-shockwave-flash\');
55 // Flash animation// show sign in box
56 header(\'HTTP/1.1 401 Unauthorized\');
57 header(\'WWW-Authenticate: Basic realm="Top Secret"\');
58 print \'Text that will be displayed if the user hits cancel or \';
59 print \'enters wrong login data\';
60 ?>
4 * 整理：www.jbxue.com
5 */
6 // fix 404 pages:
7 header(\'HTTP/1.1 200 OK\');
8 // set 404 header:
9 header(\'HTTP/1.1 404 Not Found\');
10 // set Moved Permanently header (good for redrictions)
11 // use with location header
12 header(\'HTTP/1.1 301 Moved Permanently\');
13 // redirect to a new location:
14 header(\'Location: http://www.jbxue.com/\');
15 // redrict with delay:
16 header(\'Refresh: 10; url=http://www.jbxue.com/\');
17 print \'You will be redirected in 10 seconds\';
18 // you could also use the HTML syntax:// <meta http-equiv="refresh" content="10;http://www.jbxue.com/ />
19 // override X-Powered-By: PHP:
20 header(\'X-Powered-By: PHP/4.4.0\');
21 header(\'X-Powered-By: Brain/0.6b\');
22 // content language (en = English)
23 header(\'Content-language: en\');
24 // last modified (good for caching)
25 $time = time() – 60; // or filemtime($fn), etc
26 header(\'Last-Modified: \'.gmdate(\'D, d M Y H:i:s\', $time).\' GMT\');
27 // header for telling the browser that the content
28 // did not get changed
29 header(\'HTTP/1.1 304 Not Modified\');
30 // set content length (good for caching):
31 header(\'Content-Length: 1234\');
32 // Headers for an download:
33 header(\'Content-Type: application/octet-stream\');
34 header(\'Content-Disposition: attachment; filename="example.zip"\');
35 header(\'Content-Transfer-Encoding: binary\');
36 // load the file to send:readfile(\'example.zip\');
37 // Disable caching of the current document:
38 header(\'Cache-Control: no-cache, no-store, max-age=0, must-revalidate\');
39 header(\'Expires: Mon, 26 Jul 1997 05:00:00 GMT\');
40 // Date in the pastheader(\'Pragma: no-cache\');
41 // set content type:
42 header(\'Content-Type: text/html; charset=iso-8859-1\');
43 header(\'Content-Type: text/html; charset=utf-8\');
44 header(\'Content-Type: text/plain\');
45 // plain text file
46 header(\'Content-Type: image/jpeg\');
47 // JPG picture
48 header(\'Content-Type: application/zip\');
49 // ZIP file
50 header(\'Content-Type: application/pdf\');
51 // PDF file
52 header(\'Content-Type: audio/mpeg\');
53 // Audio MPEG (MP3,…) file
54 header(\'Content-Type: application/x-shockwave-flash\');
55 // Flash animation// show sign in box
56 header(\'HTTP/1.1 401 Unauthorized\');
57 header(\'WWW-Authenticate: Basic realm="Top Secret"\');
58 print \'Text that will be displayed if the user hits cancel or \';
59 print \'enters wrong login data\';
60 ?>