Unexpected error calling class
<p>I use the below code</p>

<pre><code>echo "Start";
class A extends B
{
   //stuff
}

abstract class B extends C
{
   //stuff
}

abstract class C
{
   //stuff
}
echo "end";
</code></pre>

<p>When I run this page it doesn't shows any error but it not executed. "Start" is echoed but "end" is not echoed. Can anyone please explain where I am doing wrong? It's really needed.</p>
