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在PHP中可以通過header函數來發送頭信息，還可以設置文件的content-type，下面整理了一些常見文件類型對於的content-type值。

//date 2015-06-22
//定義編碼
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‘);

//設置一個404頭:
header(‘HTTP/1.1 404 Not Found‘);

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

//轉到一個新地址
header(‘Location: http://www.example.org/‘);
//文件延遲轉向:
header(‘Refresh: 10; url=http://www.example.org/‘);
print ‘You will be redirected in 10 seconds‘;

//當然，也可以使用html語法實現
// <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‘);

//文檔語言
header(‘Content-language: en‘);

//告訴瀏覽器最後一次修改時間
$time = time() - 60; // or filemtime($fn), etc
header(‘Last-Modified: ‘.gmdate(‘D, d M Y H:i:s‘, $time).‘ GMT‘);

//告訴瀏覽器文檔內容沒有發生改變
header(‘HTTP/1.1 304 Not Modified‘);

//設置內容長度
header(‘Content-Length: 1234‘);

//設置為一個下載類型
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‘);

// 對當前文檔禁用緩存
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‘);

//設置內容類型:
header(‘Content-Type: text/html; charset=iso-8859-1‘);
header(‘Content-Type: text/html; charset=utf-8‘);
header(‘Content-Type: text/plain‘); //純文本格式
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‘); // 音頻文件
header(‘Content-Type: application/x-shockw**e-flash‘); //Flash動畫

//顯示登陸對話框
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‘;

php設置文件類型content-type