Do you have to check whether 'REQUEST_METHOD' exists in the $_SERVER variable before using it?
<p>Do I have to check whether the <code>$_SERVER</code> variable has a key <code>REQUEST_METHOD</code> before actually using <code>$_SERVER['REQUEST_METHOD']</code>?</p>

<p>That is, is it overly defensive to <em>always</em> check whether a key exists in array variable like <code>$_SERVER</code>?</p>
