<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >session_cache_expire</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 会话处理函数" HREF="ref.session.html"><LINK REL="NEXT" TITLE="session_cache_limiter" HREF="function.session-cache-limiter.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="ref.session.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-cache-limiter.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.session-cache-expire" ></A >session_cache_expire</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN208222" ></A ><P > (PHP 4 >= 4.2.0, PHP 5)</P >session_cache_expire -- Return current cache expire</DIV ><DIV CLASS="refsect1" ><A NAME="AEN208225" ></A ><H2 >Description</H2 >int <B CLASS="methodname" >session_cache_expire</B > ( [int new_cache_expire] )<BR ></BR ><P > <B CLASS="function" >session_cache_expire()</B > returns the current setting of <TT CLASS="literal" >session.cache_expire</TT >. The value returned should be read in minutes, defaults to 180. If <CODE CLASS="parameter" >new_cache_expire</CODE > is given, the current cache expire is replaced with <CODE CLASS="parameter" >new_cache_expire</CODE >. </P ><P > The cache expire is reset to the default value of 180 stored in <TT CLASS="literal" >session.cache_limiter</TT > at request startup time. Thus, you need to call <B CLASS="function" >session_cache_expire()</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="AEN208242" ></A ><P ><B >例 1. <B CLASS="function" >session_cache_expire()</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">$cache_limiter </font><font color="#007700">= </font><font color="#0000BB">session_cache_limiter</font><font color="#007700">();<br /><br /></font><font color="#FF8000">/* set the cache expire to 30 minutes */<br /></font><font color="#0000BB">session_cache_expire</font><font color="#007700">(</font><font color="#0000BB">30</font><font color="#007700">);<br /></font><font color="#0000BB">$cache_expire </font><font color="#007700">= </font><font color="#0000BB">session_cache_expire</font><font color="#007700">();<br /><br /></font><font color="#FF8000">/* start the session */<br /><br /></font><font color="#0000BB">session_start</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 />echo </font><font color="#DD0000">"The cached session pages expire after $cache_expire minutes"</font><font color="#007700">;<br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE ><DIV CLASS="note" ><BLOCKQUOTE CLASS="note" ><P ><B >注意: </B > Setting <CODE CLASS="parameter" >new_cache_expire</CODE > is of value only, if <TT CLASS="literal" >session.cache_limiter</TT > is set to a value <SPAN CLASS="emphasis" ><I CLASS="emphasis" >different</I ></SPAN > from <TT CLASS="literal" >nocache</TT >. </P ></BLOCKQUOTE ></DIV ><P > See also the configuration settings <A HREF="ref.session.html#ini.session.cache-expire" > session.cache_expire</A >, <A HREF="ref.session.html#ini.session.cache-limiter" > session.cache_limiter</A > and <A HREF="function.session-cache-limiter.html" ><B CLASS="function" >session_cache_limiter()</B ></A >. </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="ref.session.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-cache-limiter.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Session 会话处理函数</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_cache_limiter</TD ></TR ></TABLE ></DIV ></BODY ></HTML >