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<title>Predefined Constants</title>
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<h1>Predefined Constants</h1>
<p class="simpara">
The constants below are defined by this extension, and
will only be available when the extension has either
been compiled into PHP or dynamically loaded at runtime.
</p>
<dl>
<dt id="constant.sid">
<span class="term">
<strong><code>SID</code></strong>
(<span class="type"><a href="language.types.string.html" class="type string">string</a></span>)
</span>
<dd>
<span class="simpara">
Constant containing either the session name and session ID in
the form of <em>"name=ID"</em> or empty string
if session ID was set in an appropriate session cookie. This is
the same id as the one returned by <span class="function"><a href="function.session-id.html" class="function">session_id()</a></span>.
</span>
</dd>
</dt>
<dt id="constant.php-session-disabled">
<span class="term">
<strong><code>PHP_SESSION_DISABLED</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type int">int</a></span>)
</span>
<dd>
<span class="simpara">
Since PHP 5.4.0. Return value of <span class="function"><a href="function.session-status.html" class="function">session_status()</a></span> if sessions are disabled.
</span>
</dd>
</dt>
<dt id="constant.php-session-none">
<span class="term">
<strong><code>PHP_SESSION_NONE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type int">int</a></span>)
</span>
<dd>
<span class="simpara">
Since PHP 5.4.0. Return value of <span class="function"><a href="function.session-status.html" class="function">session_status()</a></span> if sessions are enabled,
but no session exists.
</span>
</dd>
</dt>
<dt id="constant.php-session-active">
<span class="term">
<strong><code>PHP_SESSION_ACTIVE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type int">int</a></span>)
</span>
<dd>
<span class="simpara">
Since PHP 5.4.0. Return value of <span class="function"><a href="function.session-status.html" class="function">session_status()</a></span> if sessions are enabled,
and a session exists.
</span>
</dd>
</dt>
</dl>
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