📄 function.session-cache-limiter.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Get and/or set the current cache limiter</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.session-cache-expire.html">session_cache_expire</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.session-commit.html">session_commit</a></div> <div class="up"><a href="ref.session.html">Session Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.session-cache-limiter" class="refentry"> <div class="refnamediv"> <h1 class="refname">session_cache_limiter</h1> <p class="verinfo">(PHP 4 >= 4.0.3, PHP 5)</p><p class="refpurpose"><span class="refname">session_cache_limiter</span> — <span class="dc-title">Get and/or set the current cache limiter</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">string</span> <span class="methodname"><b><b>session_cache_limiter</b></b></span> ([ <span class="methodparam"><span class="type">string</span> <tt class="parameter">$cache_limiter</tt></span> ] )</div> <p class="para rdfs-comment"> <b>session_cache_limiter()</b> returns the name of the current cache limiter. </p> <p class="para"> The cache limiter defines which cache control HTTP headers are sent to the client. These headers determine the rules by which the page content may be cached by the client and intermediate proxies. Setting the cache limiter to <i>nocache</i> disallows any client/proxy caching. A value of <i>public</i> permits caching by proxies and the client, whereas <i>private</i> disallows caching by proxies and permits the client to cache the contents. </p> <p class="para"> In <i>private</i> mode, the Expire header sent to the client may cause confusion for some browsers, including Mozilla. You can avoid this problem by using <i>private_no_expire</i> mode. The expire header is never sent to the client in this mode. </p> <p class="para"> The cache limiter is reset to the default value stored in <a href="session.configuration.html#ini.session.cache-limiter" class="link">session.cache_limiter</a> at request startup time. Thus, you need to call <b>session_cache_limiter()</b> for every request (and before <a href="function.session-start.html" class="function">session_start()</a> is called). </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">cache_limiter</tt></i></span> <dd> <p class="para"> If <i><tt class="parameter">cache_limiter</tt></i> is specified, the name of the current cache limiter is changed to the new value. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns the name of the current cache limiter. </p> </div> <div class="refsect1 changelog"> <h3 class="title">ChangeLog</h3> <p class="para"> <table class="informaltable"> <colgroup> <thead valign="middle"> <tr valign="middle"> <th colspan="1">Version</th> <th colspan="1">Description</th> </tr> </thead> <tbody valign="middle" class="tbody"> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">4.2.0</td> <td colspan="1" rowspan="1" align="left"> The <i>private_no_expire</i> cache limiter was added. </td> </tr> </tbody> </colgroup> </table> </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>session_cache_limiter()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /><br /></span><span style="color: #FF8000">/* set the cache limiter to 'private' */<br /><br /></span><span style="color: #0000BB">session_cache_limiter</span><span style="color: #007700">(</span><span style="color: #DD0000">'private'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$cache_limiter </span><span style="color: #007700">= </span><span style="color: #0000BB">session_cache_limiter</span><span style="color: #007700">();<br /><br />echo </span><span style="color: #DD0000">"The cache limiter is now set to $cache_limiter<br />"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="session.configuration.html#ini.session.cache-limiter" class="link">session.cache_limiter</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.session-cache-expire.html">session_cache_expire</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.session-commit.html">session_commit</a></div> <div class="up"><a href="ref.session.html">Session Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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