Which to use: REMOTE_ADDR or SERVER_ADDR
<p>Any real difference between </p>

<pre><code>$_SERVER['REMOTE_ADDR']
$_SERVER['SERVER_ADDR']
</code></pre>

<p>I'm tracking visitors to a page, and I've always used <code>REMOTE_ADDR</code>, but recently I saw a script that collected both information. Is this a better practice or not needed?</p>
