Destructor method in PHP - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a destructor method in a PHP class.

PHP

<?php
class Sample {
    public function [1]() {
        echo "Destructor called";
    }
}
?>

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

Adelete

B__construct

C__destruct

Ddestruct

Attempts:

3 left

💡 Hint

Common Mistakes

Using __construct instead of __destruct

Omitting the double underscores

Naming the method destruct without underscores

The destructor method in PHP is named __destruct. It is called when an object is destroyed.

2fill in blank

medium

Complete the code to call the destructor automatically when the object is destroyed.

PHP

<?php
class Logger {
    public function __destruct() {
        echo "Closing log file.";
    }
}
$log = new Logger();
[1];

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

Aunset($log)

Bdelete $log

Cdestroy($log)

Dremove($log)

Attempts:

3 left

💡 Hint

Common Mistakes

Using delete which is not a PHP keyword

Using destroy or remove which do not exist in PHP

Using unset($log) destroys the object and triggers the destructor.

3fill in blank

hard

Fix the error in the destructor method name to ensure it is called properly.

PHP

<?php
class FileHandler {
    public function [1]() {
        echo "File closed.";
    }
}
?>

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

Adestruct

B__destruct

C__destructor

Ddelete

Attempts:

3 left

💡 Hint

Common Mistakes

Using __destructor instead of __destruct

Omitting underscores

Using unrelated names like delete

The correct destructor method name is __destruct. Other names will not be called automatically.

4fill in blank

hard

Fill both blanks to create a class with a destructor that outputs a message when the object is destroyed.

PHP

<?php
class UserSession {
    public function [1]() {
        echo "Session ended.";
    }
}
$session = new UserSession();
[2]($session);

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

A__destruct

Bunset

Cdelete

D__construct

Attempts:

3 left

💡 Hint

Common Mistakes

Using __construct instead of __destruct

Using delete which is not a PHP function

The destructor method is __destruct. Calling unset($session) destroys the object and triggers the destructor.

5fill in blank

hard

Fill all three blanks to define a class with a destructor that frees a resource and outputs a message when the object is destroyed.

PHP

<?php
class DatabaseConnection {
    private $conn;
    public function __construct() {
        $this->conn = "Connected";
    }
    public function [1]() {
        $this->conn = null;
        echo [2];
    }
}
$db = new DatabaseConnection();
[3]($db);

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

A__destruct

Bunset

C"Connection closed."

D__construct

Attempts:

3 left

💡 Hint

Common Mistakes

Using __construct instead of __destruct

Not using quotes around the message

Using delete instead of unset

The destructor method is __destruct. It frees the connection and prints the message. Using unset($db) destroys the object and calls the destructor.