Interface declaration and implementation in PHP - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare an interface named Vehicle.

PHP

<?php
interface [1] {
    public function start();
}
?>

Drag options to blanks, or click blank then click option'

AStartable

BCar

CDrive

DVehicle

Attempts:

3 left

💡 Hint

Common Mistakes

Using a class name instead of an interface name.

Forgetting to use the keyword 'interface'.

The keyword interface is followed by the interface name. Here, the interface is named Vehicle.

2fill in blank

medium

Complete the code to implement the Vehicle interface in the Car class.

PHP

<?php
interface Vehicle {
    public function start();
}

class Car [1] Vehicle {
    public function start() {
        echo "Car started";
    }
}
?>

Drag options to blanks, or click blank then click option'

Auses

Bextends

Cimplements

Dinherits

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'extends' instead of 'implements' for interfaces.

Forgetting to implement all interface methods.

In PHP, a class implements an interface using the keyword implements.

3fill in blank

hard

Fix the error in the code by completing the method signature in the Car class.

PHP

<?php
interface Vehicle {
    public function start();
}

class Car implements Vehicle {
    public function [1] {
        echo "Car started";
    }
}
?>

Drag options to blanks, or click blank then click option'

Astart()

Bbegin()

CStart()

Dstart

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting parentheses in the method declaration.

Using a different method name than declared in the interface.

The method name must exactly match the interface method including parentheses. So it should be start().

4fill in blank

hard

Fill both blanks to declare an interface and a class that implements it with a method.

PHP

<?php
interface [1] {
    public function [2]();
}

class Bike implements Vehicle {
    public function start() {
        echo "Bike started";
    }
}
?>

Drag options to blanks, or click blank then click option'

AVehicle

BCar

Cstart

Drun

Attempts:

3 left

💡 Hint

Common Mistakes

Using different method names in interface and class.

Mismatching interface and class names.

The interface is named Vehicle and the method declared is start(), matching the class implementation.

5fill in blank

hard

Fill all three blanks to create an interface with two methods and a class implementing both.

PHP

<?php
interface [1] {
    public function [2]();
    public function [3]();
}

class Plane implements Flyable {
    public function takeOff() {
        echo "Plane taking off";
    }
    public function land() {
        echo "Plane landing";
    }
}
?>

Drag options to blanks, or click blank then click option'

AFlyable

BtakeOff

Cland

Dstart

Attempts:

3 left

💡 Hint

Common Mistakes

Not implementing all interface methods in the class.

Using method names in the interface that don't match the class.

The interface is named Flyable and declares two methods: takeOff() and land(), which the class Plane implements.