<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <title>Find out whether a global variable is registered in a session</title> </head> <body><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.session-id.html">session_id</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.session-module-name.html">session_module_name</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-is-registered" class="refentry"> <div class="refnamediv"> <h1 class="refname">session_is_registered</h1> <p class="verinfo">(PHP 4, PHP 5 < 5.4.0)</p><p class="refpurpose"><span class="refname">session_is_registered</span> — <span class="dc-title">Find out whether a global variable is registered in a session</span></p> </div> <div class="refsect1 description" id="refsect1-function.session-is-registered-description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">bool</span> <span class="methodname"><strong>session_is_registered</strong></span> ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$name</code></span> )</div> <p class="para rdfs-comment"> Finds out whether a global variable is registered in a session. </p> <div class="warning"><strong class="warning">Warning</strong><p class="simpara">This function has been <em class="emphasis">DEPRECATED</em> as of PHP 5.3.0 and <em class="emphasis">REMOVED</em> as of PHP 5.4.0.</p></div> </div> <div class="refsect1 parameters" id="refsect1-function.session-is-registered-parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><em><code class="parameter">name</code></em></span> <dd> <p class="para"> The variable name. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues" id="refsect1-function.session-is-registered-returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> <span class="function"><strong>session_is_registered()</strong></span> returns <strong><code>TRUE</code></strong> if there is a global variable with the name <em><code class="parameter">name</code></em> registered in the current session, <strong><code>FALSE</code></strong> otherwise. </p> </div> <div class="refsect1 notes" id="refsect1-function.session-is-registered-notes"> <h3 class="title">Notes</h3> <blockquote class="note"><p><strong class="note">Note</strong>: <p class="para"> If <var class="varname"><var class="varname"><a href="reserved.variables.session.html" class="classname">$_SESSION</a></var></var> (or <var class="varname"><var class="varname">$HTTP_SESSION_VARS</var></var> for PHP 4.0.6 or less) is used, use <span class="function"><a href="function.isset.html" class="function">isset()</a></span> to check a variable is registered in <var class="varname"><var class="varname"><a href="reserved.variables.session.html" class="classname">$_SESSION</a></var></var>. </p> </p></blockquote> <div class="caution"><strong class="caution">Caution</strong> <p class="para"> If you are using <var class="varname"><var class="varname"><a href="reserved.variables.session.html" class="classname">$_SESSION</a></var></var> (or <var class="varname"><var class="varname">$HTTP_SESSION_VARS</var></var>), do not use <span class="function"><a href="function.session-register.html" class="function">session_register()</a></span>, <span class="function"><strong>session_is_registered()</strong></span> and <span class="function"><a href="function.session-unregister.html" class="function">session_unregister()</a></span>. </p> </div> </div> </div><hr /><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.session-id.html">session_id</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.session-module-name.html">session_module_name</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>