How to make a final variable in PHP?
<p>I can't find out, or maybe I am thinking wrongly but I need to make a variable that can't be changed, like read-only, something like :</p>

<pre><code>final $finalVar = 'extremely secret number'; // don't change

$finalVar = 'hacked...'; // THROW I GIANT BIG ERROR HERE !
</code></pre>