Skip to content
CoursesPHP for Beginners
Quiz · Inheritance and interfaces · lesson 4 of 8

Quiz — an interface and instanceof

Question 1 of 2

What does the program print?

PHP
<?php

interface Shape
{
    public function area(): float;
}
class Square implements Shape
{
    public function area(): float { return 3 ** 2; }
}
$s = new Square();
echo $s instanceof Shape ? 'yes' : 'no', ' ', $s->area(), "\n";