Does it matter whether or not you call exit after a header("Location: ") call?
<p>I couldn't seem to find an answer until I found <a href="http://www.php.net/manual/en/function.exit.php#90713" rel="nofollow">this post</a> on <code>exit</code> over at php.net.</p>

<blockquote>
  <p>After sending the `Location:' header PHP <em>will</em> continue parsing, and all code below the header() call will still be executed.</p>
</blockquote>

<p>Is this valid?</p>

<p>And to further this question, if it is valid, to what benefit does it have to leave <code>exit</code> out (and let the rest of the code run)?</p>
