PHP 使用header函数设置HTTP头的示例解析

//定义编码 
header( 'Content-Type:text/html;charset=utf-8 '); 

//Atom 
header('Content-type: application/atom+xml'); 

//CSS 
header('Content-type: text/css'); 

//Javascript 
header('Content-type: text/javascript'); 

//JPEG Image 
header('Content-type: image/jpeg'); 

//JSON 
header('Content-type: application/json'); 

//PDF 
header('Content-type: application/pdf'); 

//RSS 
header('Content-Type: application/rss+xml; charset=ISO-8859-1'); 

//Text (Plain) 
header('Content-type: text/plain'); 

//XML 
header('Content-type: text/xml'); 

// ok 
header('HTTP/1.1 200 OK'); 

//设置一个404头: 
header('HTTP/1.1 404 Not Found'); 

//设置地址被永久的重定向 
header('HTTP/1.1 301 Moved Permanently'); 

//转到一个新地址 
header('Location: http://www.example.org/'); 

//文件延迟转向: 
header('Refresh: 10; url=http://www.example.org/'); 
print 'You will be redirected in 10 seconds'; 

//当然，也可以使用html语法实现 
// <meta http-equiv="refresh" content="10;http://www.example.org/ /> 

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

//文档语言 
header('Content-language: en'); 

//告诉浏览器最后一次修改时间 
$time = time() - 60; // or filemtime($fn), etc 
header('Last-Modified: '.gmdate('D, d M Y H:i:s', $time).' GMT'); 

//告诉浏览器文档内容没有发生改变 
header('HTTP/1.1 304 Not Modified'); 

//设置内容长度 
header('Content-Length: 1234'); 

//设置为一个下载类型 
header('Content-Type: application/octet-stream'); 
header('Content-Disposition: attachment; filename="example.zip"'); 
header('Content-Transfer-Encoding: binary'); 
// load the file to send: 
readfile('example.zip'); 

// 对当前文档禁用缓存 
header('Cache-Control: no-cache, no-store, max-age=0, must-revalidate'); 
header('Expires: Mon, 26 Jul 1997 05:00:00 GMT'); // Date in the past 
header('Pragma: no-cache'); 

//设置内容类型: 
header('Content-Type: text/html; charset=iso-8859-1'); 
header('Content-Type: text/html; charset=utf-8'); 
header('Content-Type: text/plain'); //纯文本格式 
header('Content-Type: image/jpeg'); //JPG*** 
header('Content-Type: application/zip'); // ZIP文件 
header('Content-Type: application/pdf'); // PDF文件 
header('Content-Type: audio/mpeg'); // 音频文件 
header('Content-Type: application/x-shockw**e-flash'); //Flash动画 

//显示登陆对话框 
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';