Detailed explanation of some common instructions based on header_PHP tutorial

header常用指令
header分为三部分：
第一部分为HTTP协议的版本(HTTP-Version)；
第二部分为状态代码(Status)；
第三部分为原因短语(Reason-Phrase)。

// fix 404 pages:   用这个header指令来解决URL重写产生的404 header
header('HTTP/1.1 200 OK');  

// set 404 header:   页面没找到
header('HTTP/1.1 404 Not Found');  

//页面被永久删除，可以告诉搜索引擎更新它们的urls
// set Moved Permanently header (good for redrictions)  
// use with location header  
header('HTTP/1.1 301 Moved Permanently'); 

// 访问受限
header('HTTP/1.1 403 Forbidden');

// 服务器错误
header('HTTP/1.1 500 Internal Server Error');

// 重定向到一个新的位置
// redirect to a new location:  
header('Location: http://www.example.org/');  

延迟一段时间后重定向
// redrict with delay:  
header('Refresh: 10; url=http://www.example.org/');  
print 'You will be redirected in 10 seconds';  

// 覆盖 X-Powered-By value
// override X-Powered-By: PHP:  
header('X-Powered-By: PHP/4.4.0');  
header('X-Powered-By: Brain/0.6b');  

// 内容语言 (en = English)
// content language (en = English)  
header('Content-language: en');  

//最后修改时间(在缓存的时候可以用到)
// last modified (good for caching)  
$time = time() - 60; // or filemtime($fn), etc  
header('Last-Modified: '.gmdate('D, d M Y H:i:s', $time).' GMT');  

// 告诉浏览器要获取的内容还没有更新
// header for telling the browser that the content  
// did not get changed  
header('HTTP/1.1 304 Not Modified');  

// 设置内容的长度 (缓存的时候可以用到):
// set content length (good for caching):  
header('Content-Length: 1234');  

// 用来下载文件:
// Headers for an download:  
header('Content-Type: application/octet-stream');  
header('Content-Disposition: attachment; filename="example.zip"');  
header('Content-Transfer-Encoding: binary');  

// 禁止缓存当前文档:
// load the file to send:readfile('example.zip');  
// Disable caching of the current document:  
header('Cache-Control: no-cache, no-store, max-age=0, must-revalidate');  
header('Expires: Mon, 26 Jul 1997 05:00:00 GMT');  

// 设置内容类型:
// Date in the pastheader('Pragma: no-cache');  
// set content type:  
header('Content-Type: text/html; charset=iso-8859-1');  
header('Content-Type: text/html; charset=utf-8');  
header('Content-Type: text/plain');  

// plain text file  
header('Content-Type: image/jpeg');  

// JPG picture  
header('Content-Type: application/zip');  

// ZIP file  
header('Content-Type: application/pdf');  

// PDF file  
header('Content-Type: audio/mpeg');  

// Audio MPEG (MP3,...) file  
header('Content-Type: application/x-shockwave-flash');  

// 显示登录对话框，可以用来进行HTTP认证
// Flash animation// show sign in box  
header('HTTP/1.1 401 Unauthorized');  
header('WWW-Authenticate: Basic realm="Top Secret"');  
print 'Text that will be displayed if the user hits cancel or ';  

print 'enters wrong login data';?>

// 发送一个200 正常响应
header("HTTP/1.1 200 OK");

// 发送一个404 找不到资源响应
header('HTTP/1.1 404 Not Found');

// 发送一个301 永久重定向
header('HTTP/1.1 301 Moved Permanently');

// 发送一个503 网站暂时不能访问
header('HTTP/1.1 503 Service Temporarily Unavailable');

// 网页重定向
header('Location: http://www.jb51.net');

// 设置网页3秒后重定向
header('Refresh: 3; url=http://www.jb51.net');
echo '网页将在3秒后跳转到http://www.jb51.net';

//Set web page encoding
header('Content-Type: text/html; charset=utf-8');

//Set the web page to output an image stream
header('Content-Type: image/jpeg');

//Set the web page to output a pdf document
header('Content-Type: application/pdf');

// Set the web page to output a zip file
header('Content-Type: application/zip');

http://www.bkjia.com/PHPjc/327430.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/327430.htmlTechArticleheaderCommon instructionsThe header is divided into three parts: The first part is the version of the HTTP protocol (HTTP-Version); The second part is the version of the HTTP protocol (HTTP-Version); The first part is the status code (Status); the third part is the reason phrase (Reason-Phrase). ...