[Solved] Given the code below, what will be the output?class Vehicle {} class Car extends Vehicle {} function startEngine(Vehicle $v) { echo get_class($v); } $car = new Car(); startEngine($car); | PHP

PHP - Inheritance and Polymorphism

Given the code below, what will be the output?

class Vehicle {}
class Car extends Vehicle {}

function startEngine(Vehicle $v) {
    echo get_class($v);
}

$car = new Car();
startEngine($car);

AError: Type mismatch

BVehicle

CCar

DNo output

Step-by-Step Solution

Solution:

Step 1: Understand type hinting with inheritance
The function expects a Vehicle object or subclass. Car extends Vehicle, so passing Car is valid.
Step 2: Analyze output of get_class()
get_class($v) returns the actual class name of the object, which is 'Car'.
Final Answer:
Car -> Option C
Quick Check:
Type hint accepts subclass; get_class returns actual class [OK]

Quick Trick: get_class shows actual object class, not type hint [OK]

Common Mistakes:

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