Constructor method in PHP - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a constructor method in the class.

PHP

<?php
class Car {
    public function [1]() {
        echo "Car created!";
    }
}
$car = new Car();
?>

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

Acreate

Bconstructor

C__construct

Dinit

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'constructor' instead of '__construct'.

Forgetting the double underscores.

In PHP, the constructor method is named __construct. It runs automatically when an object is created.

2fill in blank

medium

Complete the constructor to accept a parameter and assign it to a property.

PHP

<?php
class Car {
    public $color;
    public function __construct([1]) {
        $this->color = $color;
    }
}
$car = new Car('red');
echo $car->color;

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

A$color

Bcolor

C$this->color

Dthis->color

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting the dollar sign in the parameter.

Using property syntax in the parameter list.

The constructor parameter must be a variable with a dollar sign, like $color, to receive the value.

3fill in blank

hard

Fix the error in the constructor method name.

PHP

<?php
class Bike {
    public function [1]() {
        echo "Bike ready!";
    }
}
$bike = new Bike();
?>

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

Aconstruct

B__construct

C_construct

Dconstructor

Attempts:

3 left

💡 Hint

Common Mistakes

Using only one underscore.

Using 'constructor' instead of '__construct'.

The correct constructor method name in PHP is __construct with two underscores at the start.

4fill in blank

hard

Fill both blanks to create a constructor that sets two properties.

PHP

<?php
class Person {
    public $name;
    public $age;
    public function __construct([1], [2]) {
        $this->name = $name;
        $this->age = $age;
    }
}
$person = new Person('Alice', 30);
echo $person->name . ' is ' . $person->age . ' years old.';

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

A$name

B$age

Cname

Dage

Attempts:

3 left

💡 Hint

Common Mistakes

Using property names without dollar signs as parameters.

Mixing variable and property names.

The constructor parameters must be variables with dollar signs: $name and $age.

5fill in blank

hard

Fill all three blanks to create a constructor that sets a property and calls a method.

PHP

<?php
class Dog {
    public $breed;
    public function __construct([1]) {
        $this->breed = $breed;
        $this->[2]();
    }
    private function [3]() {
        echo "Dog breed is set.";
    }
}
$dog = new Dog('Beagle');

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

A$breed

Bbark

CshowMessage

Ddisplay

Attempts:

3 left

💡 Hint

Common Mistakes

Calling a method that is not defined.

Using method names that don't match.

The constructor parameter is $breed. The method called is display, so both blanks use 'display'.