How can you effectively use polymorphism in PHP to enhance class functionality without multiple inheritance?

In PHP, you can effectively use polymorphism to enhance class functionality without multiple inheritance by utilizing interfaces and abstract classes. By defining common methods in interfaces and abstract classes, you can ensure that different classes implement these methods in their own unique way, allowing for polymorphic behavior without the need for multiple inheritance. 

<?php

// Define an interface with common methods
interface Shape {
    public function calculateArea();
}

// Create abstract class with some common functionality
abstract class AbstractShape implements Shape {
    public function printArea() {
        echo "The area is: " . $this->calculateArea();
    }
}

// Implement different shapes
class Circle extends AbstractShape {
    private $radius;

    public function __construct($radius) {
        $this->radius = $radius;
    }

    public function calculateArea() {
        return pi() * pow($this->radius, 2);
    }
}

class Square extends AbstractShape {
    private $side;

    public function __construct($side) {
        $this->side = $side;
    }

    public function calculateArea() {
        return pow($this->side, 2);
    }
}

// Usage
$circle = new Circle(5);
$circle->printArea(); // Output: The area is: 78.539816339745

$square = new Square(4);
$square->printArea(); // Output: The area is: 16

Keywords

Polymorphism PHP class functionality multiple inheritance object-oriented programming

Related Questions