Abstract Class

<?php
abstract class ParentClass
{
    public $name;
    abstract protected function calculation($a, $b);
}
class ChildClass extends ParentClass
{
    public function calculation($c, $d)
    {
        echo $c + $d;
    }
}
$test = new ChildClass();
$test->calculation(10,20);

//We Can't create the Object of Abstract Class and Abstract Class Must contains Abstract Methods
//Abstract methods doesn't have body. Abstract Methods must be implemented in the Child class
//  OUTPUT:
//30

?> 

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