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设置常用的content-type：

//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\';  

下载xlsx文件

$filename = rtrim($_SERVER[\'DOCUMENT_ROOT\'],\'/\').\'/app/files/payment_status.csv\';  
header(\'Content-Disposition: attachment; filename=payment_status.xlsx\');  
header(\'Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet\');  
header(\'Content-Length: \' . filesize($filename));  
header(\'Content-Transfer-Encoding: binary\');  
header(\'Cache-Control: must-revalidate\');  
header(\'Pragma: public\');  
readfile($filename);