在PHP语言网站建设过程中可以通过header函数来发送头信息，还可以设置文件的content-type，下面整理了一些常见文件类型对于的content-type值。

//date 2015-06-22 
//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';