Question

Which version of PHP introduced the instanceof keyword?

(a) PHP 4

(b) PHP 5

(c) PHP 5.3

(d) PHP 6

I had been asked this question during an interview for a job.

Question is from Basics of Object-Oriented PHP- 2 topic in portion Object-Oriented PHP of PHP

Answer 1

Correct answer is (b) PHP 5

Explanation: Using instanceof keyword we can determine whether an object is an instance of a class. $manager = new Employee() … if ($manager instanceof Employee) echo “True”;