Description:
------------
An abstract class should hold one abstract methods.
The class that implements it, may not be declared abstract, but this simple structure does not give the results expected

Reproduce code:
---------------
abstract class bizView {
    abstract public function getHTML();
}

abstract class bizViewFront extends bizView
{
    abstract public function getHTML();
    
    public function somethingelse() {
        echo "Something";
    }
}

class bizViewOutput extends bizViewFront
{
    public function getHTML() {
        echo "HTML";
    }
}

$test = new bizViewOutput();
$test->getHTML();

Expected result:
----------------
I would expect the text "HTML" to be printed, because the getHTML function is implemented in the child class but declared abstract in the base abstract classes. 

This is a common OOP practice. 

Actual result:
--------------
Fatal error: Can't inherit abstract function bizView::getHTML() (previously declared abstract in bizViewFront)