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header常用指令
header分為三部分：
第一部分為HTTP協(xié)議的版本(HTTP-Version)；
第二部分為狀態(tài)代碼(Status)；
第三部分為原因短語(Reason-Phrase)。

// fix 404 pages:   用這個header指令來解決URL重寫產生的404 header
header('HTTP/1.1 200 OK');

// set 404 header:   頁面沒找到
header('HTTP/1.1 404 Not Found');

//頁面被永久刪除，可以告訴搜索引擎更新它們的urls
// set Moved Permanently header (good for redrictions)
// use with location header
header('HTTP/1.1 301 Moved Permanently');

// 訪問受限
header('HTTP/1.1 403 Forbidden');

// 服務器錯誤
header('HTTP/1.1 500 Internal Server Error');

// 重定向到一個新的位置
// redirect to a new location:
header('Location: http://www.example.org/');

延遲一段時間后重定向
// redrict with delay:
header('Refresh: 10; url=http://www.example.org/');
print 'You will be redirected in 10 seconds';

// 覆蓋 X-Powered-By value
// override X-Powered-By: php:
header('X-Powered-By: php/4.4.0');
header('X-Powered-By: Brain/0.6b');

// 內容語言 (en = English)
// content language (en = English)
header('Content-language: en');

//最后修改時間(在緩存的時候可以用到)
// last modified (good for caching)
$time = time() - 60; // or filemtime($fn), etc
header('Last-Modified: '.gmdate('D, d M Y H:i:s', $time).' GMT');

// 告訴瀏覽器要獲取的內容還沒有更新
// header for telling the browser that the content
// did not get changed
header('HTTP/1.1 304 Not Modified');

// 設置內容的長度 (緩存的時候可以用到):
// set content length (good for caching):
header('Content-Length: 1234');

// 用來下載文件:
// Headers for an download:
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename="example.zip"');
header('Content-Transfer-Encoding: binary');

// 禁止緩存當前文檔:
// load the file to send:readfile('example.zip');
// Disable caching of the current document:
header('Cache-Control: no-cache, no-store, max-age=0, must-revalidate');
header('Expires: Mon, 26 Jul 1997 05:00:00 GMT');

// 設置內容類型:
// Date in the pastheader('Pragma: no-cache');
// set content type:
header('Content-Type: text/html; charset=iso-8859-1');
header('Content-Type: text/html; charset=utf-8');
header('Content-Type: text/plain');

// plain text file
header('Content-Type: image/jpeg');

// JPG picture
header('Content-Type: application/zip');

// ZIP file
header('Content-Type: application/pdf');

// PDF file
header('Content-Type: audio/mpeg');

// Audio MPEG (MP3,...) file
header('Content-Type: application/x-shockwave-flash');

// 顯示登錄對話框，可以用來進行HTTP認證
// Flash animation// show sign in box
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 ';