what exactly is $_REQUEST[$K] in PHP?
<pre><code>$_REQUEST[$k] = isset($_GET[$k]) ? $_GET[$k] : $_POST[$k];
</code></pre>

<p>or </p>

<pre><code>$_REQUEST[$k] = isset($_POST[$k]) ? $_POST[$k] : $_GET[$k];
</code></pre>

<p>Which is the case,reason?</p>
