PHP header函数分析详解

在php语言中，header（）这个函数很有用的，尤其在用到ajax时候，他会帮你解决一些意想不到的问题。下面是header的一些详细讲解。希望对phper有帮助
复制代码代码如下:
<？php
// fix 404 pages:
header（"HTTP/1.1 200 OK"）;
// set 404 header:
header（"HTTP/1.1 404 Not Found"）;
// set Moved Permanently header （good for redrictions）
// use with location header
header（"HTTP/1.1 301 Moved Permanently"）;
// redirect to a new location:
header（"Location: http://www.example.org/"）;
// redrict with delay:
header（"Refresh: 10; url=http://www.example.org/"）;
print "You will be redirected in 10 seconds";
// you could also use the HTML syntax:// <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"）;
// content language （en = English）
header（"Content-language: en"）;
// 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"）;
// header for telling the browser that the content
// did not get changed
header（"HTTP/1.1 304 Not Modified"）;
// set content length （good for caching）:
header（"Content-Length: 1234"）;
// Headers for an download:
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"）;
// 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"）;
// 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"）;
// 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 ";
print "enters wrong login data";
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