[Solved] What will be the output of this PHP code?class A {} class B extends A {} $obj = new B(); if ($obj instanceof A) { echo 'Yes'; } else { echo 'No'; } | PHP

PHP - Inheritance and Polymorphism

What will be the output of this PHP code?

class A {}
class B extends A {}
$obj = new B();
if ($obj instanceof A) {
    echo 'Yes';
} else {
    echo 'No';
}

AError

BNo

CYes

DNo output

Step-by-Step Solution

Solution:

Step 1: Understand class inheritance
Class B extends A, so B is a subclass of A.
Step 2: Check instanceof behavior
$obj is an instance of B, which is a subclass of A, so instanceof returns true.
Final Answer:
Yes -> Option C
Quick Check:
Subclass instance passes instanceof check = A [OK]

Quick Trick: instanceof returns true for subclasses too [OK]

Common Mistakes:

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