class C extends B
{
function useC()
{
$this->x = 'set from C';
}
}
class D extends C
{
function useD()
{
$this->x = 'set from D';
}
}
$x = new D();
echo serialize($x), "\n";
$x = new D();
$x->useT();
echo serialize($x), "\n";
$x = new D();
$x->useA();
echo serialize($x), "\n";
$x = new D();
$x->useB();
echo serialize($x), "\n";
$x = new D();
$x->useC();
echo serialize($x), "\n";
$x = new D();
$x->useD();
echo serialize($x), "\n";