php的header函数之设置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';  

$filename = rtrim($_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);