php header 函数详解_PHP教程

网页的缓存是由 HTTP消息头中的“Cache-control”来控制的，常见的取值有private、no-cache、<span max>-age、must-<span revalidate>1<span>-cache、must-<span revalidate>-<span age cache>-control: <span max>-age=5<span>2<span>-<span revalidate>-<span cache>-<span age>3<span>-revalidate、<span max>-<span age>-<span cache>4<span cache>-control值为“no-<span cache expires>: Fri, 31 Dec 1999 16:00:00<span gmt http cachecontrol>= no-<span cache pragma>=no-<span cache expires>= -1<span expires>-1<span>.1服务器指定 CacheControl = no-<span cache http>1.0 服务器不能使用 Cache-<span control http>1.0 服务器，IE使用Pragma:no-<span cache http>:<span><span pragma:no-cache>
则 Internet Explorer不会缓存此响应。注意：Pragma:no-cache 仅当在安全连接中使用时才防止缓存，如果在非安全页中使用，处理方式与 Expires:-<span header>-<span version>-<span phrase><span><span>
<span header>(“HTTP/1.1 404<span not found><span header>(“HTTP/1.1 404<span><span><span>
<span header>(“Location: http:<span><span hi.baidu.com>
<span header>(“HTTP/1.1 302<span found><span header>(“Location: http:<span><span hi.baidu.com>
<span header>(“Content-type: text/plain’); <span><span>
<span header>(‘Content-Disposition: attachment; filename=”weizhifeng.<span txt><span readfile>(‘weizhifeng.<span txt>/1.1<span specification><?<span php><span header>('HTTP/1.1 200 OK'<span><span><span>
<span header>('HTTP/1.1 404 Not Found'<span><span><span>
<span header>('HTTP/1.1 301 Moved Permanently');<span><span>
<span header>('Location: http://www.example.org/'<span><span><span>
<span header>('Refresh: 10; url=http://www.example.org/'<span><span print>'You will be redirected in 10 seconds'<span><span><span http-equiv="refresh" content="10;http://www.example.org/ />
// override X-Powered-By: PHP:</span>
<span header</span>('X-Powered-By: PHP/4.4.0'<span );
</span><span header</span>('X-Powered-By: Brain/0.6b'<span );
</span><span //</span><span 文档语言</span>
<span header</span>('Content-language: en'<span );
</span><span //</span><span 告诉浏览器最后一次修改时间</span>
<span $time</span>=<span time</span>() -60; <span //</span><span  or filemtime($fn), etc</span>
<span header</span>('Last-Modified: '.<span gmdate</span>('D, d M Y H:i:s',<span $time</span>).' GMT'<span );
</span><span //</span><span 告诉浏览器文档内容没有发生改变</span>
<span header</span>('HTTP/1.1 304 Not Modified');<span //</span><span 设置内容长度</span>
<span header</span>('Content-Length: 1234'<span );
</span><span //</span><span 设置为一个下载类型</span>
<span header</span>('Content-Type: application/octet-stream'<span );
</span><span header</span>('Content-Disposition: attachment; filename=" example.zip><span header>('Content-Transfer-Encoding: binary'<span><span><span load the file to send:>
<span readfile>('example.zip'<span><span><span>
<span header>('Cache-Control: no-cache, no-store, max-age=0, must-revalidate'<span><span header>('Expires: Mon, 26 Jul 1997 05:00:00 GMT'); <span><span date in the past>
<span header>('Pragma: no-cache'<span><span><span>
<span header>('Content-Type: text/html; charset=iso-8859-1'<span><span header>('Content-Type: text/html; charset=utf-8'<span><span header>('Content-Type: text/plain'); <span><span>
<span header>('Content-Type: image/jpeg'); <span><span jpg>
<span header>('Content-Type: application/zip'); <span><span zip>
<span header>('Content-Type: application/pdf'); <span><span pdf>
<span header>('Content-Type: audio/mpeg'); <span><span>
<span header>('Content-Type: application/x-shockwave-flash'); <span><span flash>
<span header>('HTTP/1.1 401 Unauthorized'<span><span header>('WWW-Authenticate: Basic realm="Top Secret"'<span><span print>'Text that will be displayed if the user hits cancel or '<span><span print>'enters wrong login data'<span>?></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>

明仔PHP零基础(一日通)

明仔PHP零基础(一日通)教程都是PHP基础，全部带详细注释，能让新接触者很容易看懂，和几个基础例子，包括登陆，数组，函数，分页的详解。

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