Session basics in Laravel - Mini Project: Build & Apply

Session basics

📖 Scenario: You are building a simple Laravel web app that needs to remember a user's favorite color during their visit.

🎯 Goal: Create a Laravel controller method that stores a favorite color in the session, then retrieves and displays it.

📋 What You'll Learn

Create a session key to store the favorite color

Set the favorite color value in the session

Retrieve the favorite color from the session

Return a view or response showing the favorite color

💡 Why This Matters

🌍 Real World

Web apps often need to remember user choices or data temporarily during a visit, like login status or preferences.

💼 Career

Understanding sessions is essential for backend web development to manage user state and data securely.

1

Create a controller method with a favorite color variable

In a Laravel controller method called showFavoriteColor, create a variable named favoriteColor and set it to the string 'blue'.

Laravel

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;

class ColorController extends Controller
{
    public function showFavoriteColor()
    {
        // Create a variable called favoriteColor and set it to 'blue'
        // Your code here
    }
}

Hint

Use $favoriteColor = 'blue'; inside the method.

2

Store the favorite color in the session

Inside the showFavoriteColor method, add a line to store the $favoriteColor variable in the session using the key 'color'. Use Laravel's session() helper function.

Laravel

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;

class ColorController extends Controller
{
    public function showFavoriteColor()
    {
        $favoriteColor = 'blue';
        // Store $favoriteColor in session with key 'color'
        // Your code here
    }
}

Hint

Use session(['color' => $favoriteColor]); to save the value.

3

Retrieve the favorite color from the session

Add a new variable called storedColor that retrieves the value from the session using the key 'color'. Use the session() helper function to get the value inside the showFavoriteColor method.

Laravel

 $favoriteColor]);
        // Retrieve the stored color from session into $storedColor
        // Your code here
    }
}

Hint

Use $storedColor = session('color'); to get the value.

4

Return a response showing the stored favorite color

Complete the showFavoriteColor method by returning a simple string response that says 'Your favorite color is: ' followed by the $storedColor variable. Use Laravel's response() helper function.

Laravel

 $favoriteColor]);
        $storedColor = session('color');
        // Return a response with the text 'Your favorite color is: ' plus $storedColor
        // Your code here
    }
}

Hint

Use return response('Your favorite color is: ' . $storedColor); to send the text.

Practice

1. What is the main purpose of sessions in Laravel?

easy

A. To store user data across multiple requests

B. To compile CSS and JavaScript files

C. To send emails to users

D. To manage database migrations

Solution

1. Step 1: Understand what sessions do

   Sessions keep user data while they browse your site, allowing data to persist between pages.

2. Step 2: Match purpose with options

   Only To store user data across multiple requests describes storing user data across requests, which is the session's role.

3. Final Answer:

   To store user data across multiple requests -> Option A

4. Quick Check:

   Sessions = store user data [OK]

Hint: Sessions keep data between pages, not for emails or files [OK]

Common Mistakes:

• Confusing sessions with asset compilation
• Thinking sessions send emails
• Mixing sessions with database tasks

2. Which of the following is the correct way to store a value in Laravel session?

easy

A. session('key' => 'value');

B. Session::put('key', 'value');

C. session()->put('key', 'value');

D. session->put('key', 'value');

Solution

1. Step 1: Recall Laravel session syntax

   To store data, use the session() helper with the put method: session()->put('key', 'value');

2. Step 2: Check each option

   A has syntax error (unexpected =>); B uses facade but not imported; C uses correct helper and method; D uses wrong arrow syntax.

3. Final Answer:

   session()->put('key', 'value'); -> Option C

4. Quick Check:

   Use session()->put() to store data [OK]

Hint: Use session() helper with ->put() to save data [OK]

Common Mistakes:

• Using invalid syntax like session('key' => 'value')
• Forgetting parentheses after session()
• Using wrong arrow (->) on session helper

3. What will be the output of this Laravel code?

session()->put('name', 'Alice');
$name = session('name');
echo $name;

medium

A. null

B. Alice

C. session

D. Error

Solution

1. Step 1: Store 'Alice' in session under 'name'

   The code uses session()->put('name', 'Alice') to save the value 'Alice'.

2. Step 2: Retrieve and echo the stored value

   session('name') fetches the value 'Alice' from session and echoes it.

3. Final Answer:

   Alice -> Option B

4. Quick Check:

   Stored value 'Alice' is retrieved and printed [OK]

Hint: session('key') gets stored value; here it prints 'Alice' [OK]

Common Mistakes:

• Expecting null if session not started
• Confusing session() helper with facade
• Assuming session() returns array

4. Identify the error in this Laravel session code:

session()->put('user', 'Bob');
session()->forget('users');

medium

A. No error, code works fine

B. Wrong method name, should be remove() instead of forget()

C. session() helper cannot be used with forget()

D. Key 'users' does not exist, so forget() does nothing

Solution

1. Step 1: Check stored and forgotten keys

   The code stores 'Bob' under 'user' but tries to forget 'users' (plural), which was never stored.

2. Step 2: Understand forget() behavior

   forget() silently does nothing if the key doesn't exist; no error occurs but the intended key is not removed.

3. Final Answer:

   Key 'users' does not exist, so forget() does nothing -> Option D

4. Quick Check:

   forget() on missing key does nothing [OK]

Hint: Check exact key names when using forget() [OK]

Common Mistakes:

• Assuming forget() throws error if key missing
• Confusing forget() with remove() method
• Thinking session() helper can't call forget()

5. You want to clear all session data for a user after logout. Which Laravel code correctly does this?

hard

A. session()->flush();

B. session()->clear();

C. session()->forgetAll();

D. session()->remove();

Solution

1. Step 1: Identify method to clear all session data

   Laravel's session()->flush() removes all session data for the current user.

2. Step 2: Verify other options

   Options B, C, and D are not valid Laravel session methods.

3. Final Answer:

   session()->flush(); -> Option A

4. Quick Check:

   Use flush() to clear all session data [OK]

Hint: Use flush() to clear entire session data [OK]

Common Mistakes:

• Using non-existent methods like clear() or forgetAll()
• Trying to remove session keys one by one instead of flush()
• Confusing forget() with flush()