PHP: What does "a or b" expression mean?
<p>Came across this code:</p>

<pre><code>&lt;?php
require_once 'HTTP/Session/Container/DB.php';

$s = new HTTP_Session_Container_DB('mysql://user:password@localhost/db'); 

ini_get('session.auto_start') or session_start();  //HERE. ?? 

?&gt;
</code></pre>

<p>What does this kind of express mean in PHP? [ a OR b] ?</p>

<pre><code>ini_get('session.auto_start') or session_start();
</code></pre>

<p>Thanks. </p>
