PHP - Sort array with mixed types
<p>I have a php array with mixed types like this :</p>

<pre><code>  $length = array (15, 3, 5, '-');
</code></pre>

<p>and I want to sort it to obtain a list of values sorted like this : '-', 3, 5, 15</p>

<p>How can I do that ?</p>

<p>Thanks a lot.</p>
