Why magic methods exist in PHP - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a magic method that is called when an undefined property is accessed.

PHP

<?php
class Test {
    public function [1]($name) {
        return "Property $name does not exist.";
    }
}
$test = new Test();
echo $test->foo;
?>

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

A__set

B__get

C__call

D__construct

Attempts:

3 left

💡 Hint

Common Mistakes

Using __set instead of __get

Using __call which is for methods

Using __construct which is the constructor

The __get magic method is called when accessing an undefined or inaccessible property.

2fill in blank

medium

Complete the code to define a magic method that is called when an undefined method is called.

PHP

<?php
class Test {
    public function [1]($name, $arguments) {
        return "Method $name does not exist.";
    }
}
$test = new Test();
echo $test->foo();
?>

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

A__call

B__get

C__set

D__invoke

Attempts:

3 left

💡 Hint

Common Mistakes

Using __get which is for properties

Using __set which is for setting properties

Using __invoke which is for calling objects as functions

The __call magic method is triggered when calling inaccessible or undefined methods.

3fill in blank

hard

Fix the error in the magic method that sets a property value.

PHP

<?php
class Test {
    public function [1]($name, $value) {
        $this->$name = $value;
    }
}
$test = new Test();
$test->foo = 'bar';
echo $test->foo;
?>

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

A__get

B__construct

C__call

D__set

Attempts:

3 left

💡 Hint

Common Mistakes

Using __get instead of __set

Using __call which is for methods

Using __construct which is the constructor

The __set magic method is called when setting a value to an undefined or inaccessible property.

4fill in blank

hard

Fill both blanks to create a magic method that returns a string when the object is treated as a string.

PHP

<?php
class Test {
    public function [1]() {
        return [2];
    }
}
$test = new Test();
echo $test;
?>

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

A__toString

B__invoke

C"This is a Test object."

Dreturn

Attempts:

3 left

💡 Hint

Common Mistakes

Using __invoke which is for calling objects as functions

Not returning a string

Using return keyword as method name

The __toString magic method defines what happens when an object is converted to a string. It must return a string.

5fill in blank

hard

Fill all three blanks to create a magic method that is called when the object is used as a function.

PHP

<?php
class Test {
    public function [1]([2]) {
        return "Called with argument: " . [3];
    }
}
$test = new Test();
echo $test('hello');
?>

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

A__invoke

B$arg

D__call

Attempts:

3 left

💡 Hint

Common Mistakes

Using __call which is for undefined methods

Not using the argument variable

Using wrong method name

The __invoke magic method is called when an object is used like a function. It can accept arguments.