In PHP, how does include() exactly work?
<p>How does <code>include('./code.php');</code> work? I understand it is the equivalent of having the code "pasted" directly where the include occurs, but, for example:</p>

<p>If I have two pages, <code>page1.php</code> and <code>page2.php</code>, of which I would need to manipulate different variables and functions in <code>./code.php</code>, does <code>include()</code> create a copy of <code>./code.php</code>, or does it essentially link back to the actual page <code>./code.php</code>?</p>
