Day 13: Abstract Classes

https://www.hackerrank.com/challenges/30-abstract-classes/problem

//Write MyBook class
class MyBook extends Book {
    protected $price;
        function __construct($t, $a, $p){
        parent::__construct($t, $a);
        $this->price = $p;
    }
public function display(){
        print('Title: '.$this->title);
        print('Author: '.$this->author);
        print('Price: '.$this->price);
    }
}