Session basics in Laravel - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ component_behavior

intermediate

What is the output of this Laravel session code?

Consider this Laravel controller method that sets and retrieves session data. What will be the output when this method is called?

Laravel

<?php
public function showSession(Request $request) {
    $request->session()->put('user', 'Alice');
    $name = $request->session()->get('user');
    return "User: $name";
}

A User: Alice

B User:

C null

D Error: Undefined variable

💡 Hint

Remember that Laravel's session put and get methods store and retrieve data within the same request cycle.

The session key 'user' is set to 'Alice' and then immediately retrieved, so the output is 'User: Alice'.

❓ state_output

intermediate

What will be the session value after this code runs?

Given this Laravel code snippet, what is the value stored in session key 'count' after execution?

Laravel

<?php
public function incrementCount(Request $request) {
    $count = $request->session()->get('count', 0);
    $request->session()->put('count', $count + 1);
    return $request->session()->get('count');
}

A 1

B 0

C null

D Error: Method not found

💡 Hint

The session get method returns the default value if the key does not exist.

Initially, 'count' is not set, so get returns 0. Then it is incremented by 1 and stored back, so the value is 1.

📝 Syntax

advanced

Which option correctly retrieves a session value with a default fallback?

In Laravel, you want to get the session value for key 'theme'. If it does not exist, return 'light' as default. Which code snippet is correct?

A $theme = session()->get('theme', default='light');

B $theme = session()->get('theme', 'light');

C $theme = session()->get('theme') ?? 'light';

D $theme = session()->get('theme' ?: 'light');

💡 Hint

Check the Laravel session get method signature for default value usage.

Option B uses the correct syntax: get(key, default). Option B is invalid syntax. Option B uses PHP null coalescing but does not provide default to get method. Option B uses invalid named argument syntax.

🔧 Debug

advanced

Why does this Laravel session code cause an error?

This code throws an error. What is the cause?

Laravel

<?php
public function clearSession() {
    session()->forget('user');
    return session()->get('user');
}

A Error because session() helper is undefined

B Error because forget() method requires a second argument

C No error; returns null because 'user' key is removed

D Error because session()->get() is called without Request object

💡 Hint

Check Laravel session helper usage and method signatures.

The forget method removes the key. Then get returns null since the key no longer exists. No error occurs.

🧠 Conceptual

expert

What happens to session data when you call session()->flush() in Laravel?

Choose the correct description of the effect of calling session()->flush() in a Laravel application.

A It resets the session ID but preserves all session data.

B It deletes only the session cookie but keeps data on server.

C It clears only flash data but keeps other session data intact.

D It removes all session data for the current user immediately.

💡 Hint

Think about what flushing a session means in terms of stored data.

session()->flush() removes all data stored in the session for the current user immediately.

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()