What is the proper way to set default method parameter in PHP?
<p>Let's say you have a method that expects a numerical value as an argument. What's the proper way to set a default value in the event the argument doesn't exist?</p>

<pre><code>public function saveme($myvar = false) {}

public function saveme($myvar = '') {}

public function saveme($myvar = NULL) {}

public function saveme($myvar = 0) {}
</code></pre>
