Session vs cookie decision in PHP - Hands-On Comparison

Session vs Cookie Decision in PHP

📖 Scenario: You are building a simple PHP web application that needs to remember user preferences. You want to decide whether to use sessions or cookies to store this information.

🎯 Goal: Create a PHP script that stores a user preference using a session or a cookie based on a configuration variable. Then display the stored preference.

📋 What You'll Learn

Create an array called userPreferences with keys 'theme' and 'fontSize' and values 'dark' and 'medium' respectively.

Create a boolean variable called useSession and set it to true or false to decide storage method.

Write code that stores the userPreferences in a session if useSession is true, or in cookies if useSession is false.

Write code that retrieves and prints the stored preferences from the session or cookies.

💡 Why This Matters

🌍 Real World

Web applications often need to remember user settings like themes or font sizes. Sessions and cookies are common ways to store this information.

💼 Career

Understanding sessions and cookies is essential for web developers to manage user data securely and efficiently.

1

Create the user preferences array

Create an array called userPreferences with these exact entries: 'theme' => 'dark' and 'fontSize' => 'medium'.

PHP

 'dark' and 'fontSize' => 'medium'
// Your code here

Need a hint?

Use PHP array syntax with square brackets and key => value pairs.

2

Add the storage method configuration

Create a boolean variable called useSession and set it to true.

PHP

 'dark', 'fontSize' => 'medium'];

// Create a boolean variable useSession and set it to true
// Your code here

Need a hint?

Use = true; to assign the boolean value.

3

Store preferences using session or cookie

Write code that starts the session with session_start(). Then, if useSession is true, store userPreferences in $_SESSION['prefs']. Otherwise, store each preference in a cookie using setcookie() with keys 'theme' and 'fontSize' and expiry time 1 hour from now.

PHP

 'dark', 'fontSize' => 'medium'];

$useSession = true;

// Start session and store preferences in session or cookies based on useSession
// Your code here

Need a hint?

Remember to call session_start() before using $_SESSION.

4

Retrieve and display stored preferences

Write code that starts the session with session_start(). Then, if useSession is true, retrieve preferences from $_SESSION['prefs']. Otherwise, retrieve preferences from $_COOKIE['theme'] and $_COOKIE['fontSize']. Finally, print the preferences in the format: Theme: [theme], Font Size: [fontSize].

PHP

 'dark', 'fontSize' => 'medium'];

$useSession = true;

session_start();

if ($useSession) {
    $_SESSION['prefs'] = $userPreferences;
} else {
    setcookie('theme', $userPreferences['theme'], time() + 3600);
    setcookie('fontSize', $userPreferences['fontSize'], time() + 3600);
}

// Retrieve and print stored preferences
// Your code here

Need a hint?

Use print() with double quotes and curly braces to insert variables.