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');
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
//
// 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');
