<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >session_cache_limiter</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REL="HOME" TITLE="PHP 手册" HREF="index.html"><LINK REL="UP" TITLE="Session 会话处理函数" HREF="ref.session.html"><LINK REL="PREVIOUS" TITLE="session_cache_expire" HREF="function.session-cache-expire.html"><LINK REL="NEXT" TITLE="session_commit" HREF="function.session-commit.html"><META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=UTF-8"></HEAD ><BODY CLASS="refentry" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >PHP 手册</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="function.session-cache-expire.html" ACCESSKEY="P" >上一页</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="function.session-commit.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.session-cache-limiter" ></A >session_cache_limiter</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN208257" ></A ><P > (PHP 4 >= 4.0.3, PHP 5)</P >session_cache_limiter -- Get and/or set the current cache limiter</DIV ><DIV CLASS="refsect1" ><A NAME="AEN208260" ></A ><H2 >Description</H2 >string <B CLASS="methodname" >session_cache_limiter</B > ( [string cache_limiter] )<BR ></BR ><P > <B CLASS="function" >session_cache_limiter()</B > returns the name of the current cache limiter. If <CODE CLASS="parameter" >cache_limiter</CODE > is specified, the name of the current cache limiter is changed to the new value. </P ><P > 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 <TT CLASS="literal" >nocache</TT > disallows any client/proxy caching. A value of <TT CLASS="literal" >public</TT > permits caching by proxies and the client, whereas <TT CLASS="literal" >private</TT > disallows caching by proxies and permits the client to cache the contents. </P ><P > In <TT CLASS="literal" >private</TT > mode, the Expire header sent to the client may cause confusion for some browsers, including Mozilla. You can avoid this problem by using <TT CLASS="literal" >private_no_expire</TT > mode. The expire header is never sent to the client in this mode. </P ><DIV CLASS="note" ><BLOCKQUOTE CLASS="note" ><P ><B >注意: </B > <TT CLASS="literal" >private_no_expire</TT > was added in PHP 4.2.0. </P ></BLOCKQUOTE ></DIV ><P > The cache limiter is reset to the default value stored in <A HREF="ref.session.html#ini.session.cache-limiter" >session.cache_limiter</A > at request startup time. Thus, you need to call <B CLASS="function" >session_cache_limiter()</B > for every request (and before <A HREF="function.session-start.html" ><B CLASS="function" >session_start()</B ></A > is called). </P ><TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN208285" ></A ><P ><B >例 1. <B CLASS="function" >session_cache_limiter()</B > example</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br /><br /></font><font color="#FF8000">/* set the cache limiter to 'private' */<br /><br /></font><font color="#0000BB">session_cache_limiter</font><font color="#007700">(</font><font color="#DD0000">'private'</font><font color="#007700">);<br /></font><font color="#0000BB">$cache_limiter </font><font color="#007700">= </font><font color="#0000BB">session_cache_limiter</font><font color="#007700">();<br /><br />echo </font><font color="#DD0000">"The cache limiter is now set to $cache_limiter<br />"</font><font color="#007700">;<br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE ><P > Also see the <A HREF="ref.session.html#ini.session.cache-limiter" >session.cache_limiter</A > configuration directive. </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="function.session-cache-expire.html" ACCESSKEY="P" >上一页</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >起始页</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="function.session-commit.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >session_cache_expire</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.session.html" ACCESSKEY="U" >上一级</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >session_commit</TD ></TR ></TABLE ></DIV ></BODY ></HTML >