PHP if $_SERVER('REQUEST_URI') is empty, or only contains $_GET
<p>How can I check if the <code>$_SERVER['REQUEST_URI']</code> is empty (i.e. user visited <code>domain.com/</code>), but leave an exception for if there is a <code>$_GET</code> in the URL (<code>domain.com/?a=1</code>)</p>
