Question

I have 2 classes like

class A {
     public function B () {
         return 'b';
     }
}

class C extends A {
     public function D () {
         return 'd';
     }
}

I know that to use function b in class C I do,

class A {
     public function B () {
         return 'b';
     }
}

class C extends A {
     public function D () {
         $b = parent::B();
         return 'd';
     }
}

But what about when I initiate the object? Do I have to do (which works)

$c = new C();
$b = $c -> b();

Or do I still have to use this parent keyword?

I tried doing,

$c = new C();
$b = $c -> parent::B();

But it does not work.

Thanks

Answer 1

You do not need the parent keyword in the second example, since class C extends A, it inherits all of its member functions and variables. So, $c->b(); is perfectly valid. Here is a link to the documentation on the extends keyword, which states:

Often you need classes with similar variables and functions to another
existing class. In fact, it is good practice to define a generic class
which can be used in all your projects and adapt this class for the
needs of each of your specific projects. To facilitate this, classes
can be extensions of other classes. The extended or derived class has
all variables and functions of the base class (this is called
‘inheritance’ despite the fact that nobody died) and what you add in
the extended definition.