Abstract class
This function does something.";
}
abstract public function getArea();
}
class Rectangle extends Polygon
{
public function getArea() {
$this->area = $this->base * $this->height;
return $this->area;
}
function __construct($a, $b) {
$this->base = $a;
$this->height = $b;
}
}
$rectangle = new Rectangle(4, 6);
echo $rectangle->getArea();
?>