Variables are null in included files
<p>For some reason the file I'm including into my PHP script doesn't recognize any of the variables I've defined up until that point:</p>

<p>Main file:</p>

<pre><code>var_dump($recipients); // produces proper output
require DOCROOT. "Mail/add_message.php";
</code></pre>

<p>Included file:</p>

<pre><code>&lt;?
var_dump($recipients); // returns NULL
exit();
</code></pre>

<p>What are the possible reasons for this happening?</p>
