Source of: /manual/en/function.session-is-registered.php
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<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)</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>
<a name="function.session-is-registered.description"></a><div class="refsect1 description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">bool</span> <span class="methodname"><b>session_is_registered</b></span>
( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$name</tt></span>
)</div>
<p class="para rdfs-comment">
Finds out whether a global variable is registered in a session.
</p>
<div class="warning"><b class="warning">Warning</b><p class="simpara">This function has been
<em class="emphasis">DEPRECATED</em> as of PHP 5.3.0 and <em class="emphasis">REMOVED</em>
as of PHP 6.0.0. Relying on this feature is highly discouraged.</p></div>
</div>
<a name="function.session-is-registered.parameters"></a><div class="refsect1 parameters">
<h3 class="title">Parameters</h3>
<p class="para">
</p><dl>
<dt class="varlistentry">
<span class="term"><i><tt class="parameter">name</tt></i>
</span>
</dt><dd class="listitem">
<p class="para">
The variable name.
</p>
</dd>
</dl>
<p>
</p>
</div>
<a name="function.session-is-registered.returnvalues"></a><div class="refsect1 returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
<b>session_is_registered()</b> returns <b><tt class="constant">TRUE</tt></b> if there is a
global variable with the name <i><tt class="parameter">name</tt></i>
registered in
the current session, <b><tt class="constant">FALSE</tt></b> otherwise.
</p>
</div>
<a name="function.session-is-registered.notes"></a><div class="refsect1 notes">
<h3 class="title">Notes</h3>
<blockquote><p><b class="note">Note</b>:
If <var class="varname"><a href="reserved.variables.session.php" class="classname">$_SESSION</a></var> (or <var class="varname">$HTTP_SESSION_VARS</var>
for PHP 4.0.6 or less) is used, use <a href="function.isset.php" class="function">isset()</a> to check a
variable is registered in <var class="varname"><a href="reserved.variables.session.php" class="classname">$_SESSION</a></var>.
<br />
</p></blockquote>
<div class="caution"><b class="caution">Caution</b>
<p class="para">
If you are using <var class="varname"><a href="reserved.variables.session.php" class="classname">$_SESSION</a></var>
(or <var class="varname">$HTTP_SESSION_VARS</var>), do not use
<a href="function.session-register.php" class="function">session_register()</a>,
<b>session_is_registered()</b> and
<a href="function.session-unregister.php" class="function">session_unregister()</a>.
</p>
</div>
</div>
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