08 Abstruct Class and Method.php

<?php
// Abstract classes are declared with the abstract keyword, and contain abstract methods.
abstract class Car
{
    // Abstract classes can have properties
    protected $tankVolume;
   
    // Abstract classes can have non abstract methods
    public function setTankVolume($volume)
    {
        $this->tankVolume = $volume;
    }
   
    // Abstract method
    abstract public function calcNumMilesOnFullTank();
}

class Toyota extends Car
{
    // Since we inherited abstract method, we need to define it in the child class, 
    // by adding code to the method's body.
    public function calcNumMilesOnFullTank()
    {
        return $miles = $this->tankVolume * 33;
    }

    public function getColor()
    {
        return "beige";
    }
}

$toyota1 = new Toyota();
$toyota1->setTankVolume(10);
echo $toyota1->calcNumMilesOnFullTank();//330
echo $toyota1->getColor();//beige