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This is the "magic" of OOP. It allows different classes to be treated as instances of the same interface. For example, if you have an interface PaymentGateway , you can have a Stripe class and a PayPal class. Your checkout logic doesn't care which one it receives; as long as it follows the interface, the process() method will work. Why It Matters
class Paypal implements PaymentGateway public function pay($amount) // Logic specific to Paypal API return "Paid $$amount via Paypal."; object-oriented principles in php laracasts download
It reduces complexity and allows developers to focus on what an object does rather than how it does it.
class Dog extends Animal public function sound() echo "The dog barks."; Visit laracasts
Polymorphism literally means "many forms." It allows objects of different classes to be treated as objects of a common superclass.
// Provide a controlled way to write data (Setter) public function setStatus($status) if (!in_array($status, ['active', 'inactive', 'banned'])) throw new Exception("Invalid status"); It allows different classes to be treated as
class UserController public function index() // BAD: The controller is tightly coupled to the Database class. $db = new DatabaseConnection(); $users = $db->fetchAll('users');