<HTML ><HEAD ><TITLE >session_is_registered</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK REL="HOME" TITLE="PHP Manual" HREF="index.html"><LINK REL="UP" TITLE="Session handling functions" HREF="ref.session.html"><LINK REL="PREVIOUS" TITLE="session_id" HREF="function.session-id.html"><LINK REL="NEXT" TITLE="session_module_name" HREF="function.session-module-name.html"><META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=ISO-8859-1"></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 Manual</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="function.session-id.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="function.session-module-name.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.session-is-registered" ></A >session_is_registered</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN84493" ></A ><P > (PHP 4 )</P >session_is_registered -- Find out whether a global variable is registered in a session </DIV ><DIV CLASS="refsect1" ><A NAME="AEN84496" ></A ><H2 >Description</H2 >bool <B CLASS="methodname" >session_is_registered</B > ( string name)<BR ></BR ><P > <B CLASS="function" >session_is_registered()</B > returns <TT CLASS="constant" ><B >TRUE</B ></TT > if there is a global variable with the name <TT CLASS="parameter" ><I >name</I ></TT > registered in the current session. </P ><DIV CLASS="note" ><BLOCKQUOTE CLASS="note" ><P ><B >Note: </B > If <TT CLASS="varname" >$_SESSION</TT > (or <TT CLASS="varname" >$HTTP_SESSION_VARS</TT > for PHP 4.0.6 or less) is used, use <A HREF="function.isset.html" ><B CLASS="function" >isset()</B ></A > to check a variable is registered in <TT CLASS="varname" >$_SESSION</TT >. </P ></BLOCKQUOTE ></DIV ><DIV CLASS="caution" ><P ></P ><TABLE CLASS="caution" BORDER="1" WIDTH="100%" ><TR ><TD ALIGN="CENTER" ><B >Caution</B ></TD ></TR ><TR ><TD ALIGN="LEFT" ><P > If you are using <TT CLASS="varname" >$_SESSION</TT > (or <TT CLASS="varname" >$HTTP_SESSION_VARS</TT >), do not use <A HREF="function.session-register.html" ><B CLASS="function" >session_register()</B ></A >, <B CLASS="function" >session_is_registered()</B > and <A HREF="function.session-unregister.html" ><B CLASS="function" >session_unregister()</B ></A >. </P ></TD ></TR ></TABLE ></DIV ></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-id.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="function.session-module-name.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >session_id</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.session.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >session_module_name</TD ></TR ></TABLE ></DIV ></BODY ></HTML >