Help me understand this code
<blockquote>
  <p><strong>Possible Duplicate:</strong><br />
  <a href="http://stackoverflow.com/questions/1080247/what-is-the-php-operator-called-and-what-does-it-do">What is the PHP ? : operator called and what does it do?</a>  </p>
</blockquote>

<pre><code>$id = isset($_GET['id']) ? intval($_GET['id']) : 0;
</code></pre>

<p>Can someone help me understand the above code? I'm fairly new to php :) What up with <code>?</code> and <code>:</code>?</p>

<p>I would appreciate it!</p>
