What is the difference between is_a and instanceof?
<p>I am aware that <a href="http://php.net/manual/en/language.operators.type.php"><code>instanceof</code></a> is an operator and that <a href="http://www.php.net/manual/en/function.is-a.php"><code>is_a</code></a> is a method.</p>

<p>Is the method slower in performance? What would you prefer to use?</p>
