[Solved] What will be the output of the following PHP code?class Animal {} class Dog extends Animal {} function greet(Animal $a) { echo "Hello from Animal!"; } $dog = new Dog(); greet($dog); | PHP

PHP - Inheritance and Polymorphism

What will be the output of the following PHP code?

class Animal {}
class Dog extends Animal {}

function greet(Animal $a) {
    echo "Hello from Animal!";
}

$dog = new Dog();
greet($dog);

AFatal error: Argument must be Animal

BNo output

CHello from Dog!

DHello from Animal!

Step-by-Step Solution

Solution:

Step 1: Understand type hinting with parent classes
The function greet expects an Animal object or subclass instance.
Step 2: Check the argument passed
$dog is an instance of Dog, which extends Animal, so it is accepted.
Final Answer:
Hello from Animal! -> Option D
Quick Check:
Parent class type hint accepts subclass instance = output printed [OK]

Quick Trick: Parent class hint accepts subclass objects without error [OK]

Common Mistakes:

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