Cache configuration in Laravel - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the default cache driver in Laravel's configuration.

Laravel

'default' => env('CACHE_DRIVER', '[1]'),

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

Amemcached

Bdatabase

Credis

Dfile

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing a driver not installed or configured.

Using 'redis' without Redis installed.

The default cache driver in Laravel is usually set to file for local development.

2fill in blank

medium

Complete the code to retrieve a cached value with a fallback in Laravel.

Laravel

$value = Cache::remember('[1]', 60, function () {
    return 'default';
});

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

Akey_name

Bcache_time

Ccache_driver

Ddefault_value

Attempts:

3 left

💡 Hint

Common Mistakes

Using the cache duration as the key.

Passing the default value as the key.

The first argument to Cache::remember is the cache key name.

3fill in blank

hard

Fix the error in the cache configuration array to set the Redis connection.

Laravel

'redis' => [
    'client' => env('REDIS_CLIENT', '[1]'),
],

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

Aredisclient

Bredis

Cphpredis

Dpredis

Attempts:

3 left

💡 Hint

Common Mistakes

Using an invalid client name.

Confusing client name with connection name.

Laravel supports phpredis and predis clients; phpredis is recommended for performance.

4fill in blank

hard

Fill both blanks to configure the cache store and its prefix in Laravel.

Laravel

'stores' => [
    'memcached' => [
        'driver' => '[1]',
        'prefix' => '[2]',
    ],
],

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

Amemcached

Bredis

Claravel_cache

Dapp_cache

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'redis' as driver for Memcached store.

Leaving prefix empty or generic.

The driver for Memcached store is memcached, and the prefix is often set to laravel_cache to avoid key collisions.

5fill in blank

hard

Fill all three blanks to create a cache configuration for a database store with a table and connection.

Laravel

'database' => [
    'driver' => '[1]',
    'table' => '[2]',
    'connection' => '[3]',
],

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

Adatabase

Bcache

Cmysql

Dredis

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'redis' as driver for database cache.

Wrong table name or connection string.

The database cache store uses database as driver, cache as the default table, and mysql as the connection name.

Practice

1. What is the main purpose of cache configuration in Laravel?

easy

A. To manage user authentication settings

B. To define database table structures

C. To control how temporary data is stored to speed up the application

D. To configure email sending options

Solution

1. Step 1: Understand cache role in Laravel

   Cache stores temporary data to reduce repeated work and speed up the app.

2. Step 2: Identify cache configuration purpose

   Cache configuration sets how and where this temporary data is saved.

3. Final Answer:

   To control how temporary data is stored to speed up the application -> Option C

4. Quick Check:

   Cache configuration = speed up app by storing temporary data [OK]

Hint: Cache config controls temporary data storage for speed [OK]

Common Mistakes:

• Confusing cache with database setup
• Mixing cache with authentication or email settings
• Thinking cache stores permanent data

2. Which of the following is the correct way to set the default cache driver in Laravel's config/cache.php file?

easy

A. 'driver' => 'redis',

B. 'default' => env('CACHE_DRIVER', 'file'),

C. 'cache' => 'database',

D. 'default_driver' => 'memcached',

Solution

1. Step 1: Check Laravel cache config syntax

   The default cache driver is set with the key 'default' using env() helper.

2. Step 2: Match correct syntax

   'default' => env('CACHE_DRIVER', 'file'), uses 'default' => env('CACHE_DRIVER', 'file'), which is correct Laravel pattern.

3. Final Answer:

   'default' => env('CACHE_DRIVER', 'file'), -> Option B

4. Quick Check:

   Default cache driver set with 'default' key [OK]

Hint: Default cache driver uses 'default' key with env() [OK]

Common Mistakes:

• Using wrong key names like 'driver' or 'cache'
• Not using env() helper for flexibility
• Setting keys that don't exist in Laravel config

3. Given this snippet from config/cache.php:

'stores' => [
    'file' => [
        'driver' => 'file',
        'path' => storage_path('framework/cache/data'),
    ],
    'redis' => [
        'driver' => 'redis',
        'connection' => 'cache',
    ],
],
'default' => 'redis',

What cache store will Laravel use by default?

medium

A. array

B. file

C. database

D. redis

Solution

1. Step 1: Identify the 'default' cache driver

   The config sets 'default' => 'redis', so Redis is the default store.

2. Step 2: Confirm Redis store exists

   The 'stores' array includes a 'redis' store with proper driver and connection.

3. Final Answer:

   redis -> Option D

4. Quick Check:

   Default cache store = redis [OK]

Hint: Default key value shows which cache store is used [OK]

Common Mistakes:

• Assuming 'file' is default because it appears first
• Ignoring the 'default' key value
• Confusing store names with driver names

4. You set the cache driver to 'redis' in .env but Laravel still uses the file cache. What is the most likely cause?

medium

A. You forgot to clear the config cache with php artisan config:clear

B. Redis is not installed on your system

C. The 'file' driver is always used by default

D. You need to restart the web server

Solution

1. Step 1: Understand Laravel config caching

   Laravel caches config files for performance, so changes in .env may not apply immediately.

2. Step 2: Identify how to apply .env changes

   Running php artisan config:clear clears cached config, allowing new .env values to take effect.

3. Final Answer:

   You forgot to clear the config cache with php artisan config:clear -> Option A

4. Quick Check:

   Clear config cache to apply .env changes [OK]

Hint: Clear config cache after .env changes [OK]

Common Mistakes:

• Assuming Redis must be installed locally for Laravel to use it
• Thinking file driver is always default
• Restarting server without clearing config cache

5. You want to configure Laravel cache to use the database driver with a custom prefix to avoid key conflicts. Which of these config/cache.php settings correctly achieves this?

hard

A. 'default' => 'database', 'prefix' => 'myapp_cache_', 'stores' => ['database' => ['driver' => 'database', 'table' => 'cache']],

B. 'default' => 'file', 'prefix' => 'cache_', 'stores' => ['database' => ['driver' => 'database', 'table' => 'cache_data']],

C. 'default' => 'database', 'prefix' => 'cache_', 'stores' => ['database' => ['driver' => 'database', 'table' => 'cache']],

D. 'default' => 'redis', 'prefix' => 'myapp_', 'stores' => ['database' => ['driver' => 'database', 'table' => 'cache']],

Solution

1. Step 1: Set default driver to database

   The 'default' key must be 'database' to use the database cache driver.

2. Step 2: Set a custom prefix and database store

   The 'prefix' key should be 'myapp_cache_' to avoid conflicts, and the 'stores' array must define 'database' with correct driver and table.

3. Final Answer:

   'default' => 'database', 'prefix' => 'myapp_cache_', 'stores' => ['database' => ['driver' => 'database', 'table' => 'cache']], -> Option A

4. Quick Check:

   Default driver + prefix + database store set correctly [OK]

Hint: Set 'default', 'prefix', and 'stores.database' keys properly [OK]

Common Mistakes:

• Not matching default driver with store name
• Using wrong prefix format or missing prefix
• Setting default to wrong driver