Cache configuration in Laravel - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding Laravel Cache Drivers

Which cache driver in Laravel stores cached data in files by default?

A file

B database

C redis

D memcached

💡 Hint

Think about where Laravel stores cache if no other driver is set.

Laravel uses the file driver by default, which stores cached data as files in the storage/framework/cache directory.

❓ component_behavior

intermediate

Cache Configuration Effect on Behavior

If you set the cache driver to 'array' in Laravel's config/cache.php, what happens to the cached data after the request ends?

A Cached data persists permanently until manually cleared.

B Cached data is stored in memory and lost after the request ends.

C Cached data is saved to the database for later use.

D Cached data is stored in Redis and shared across requests.

💡 Hint

Consider what 'array' driver means for data storage scope.

The 'array' cache driver stores data only in PHP arrays during the current request. Once the request finishes, the data is lost.

📝 Syntax

advanced

Correct Cache Configuration Syntax

Which option correctly sets the Redis cache connection in Laravel's config/cache.php?

Laravel

return [
    'default' => env('CACHE_DRIVER', 'file'),
    'stores' => [
        'redis' => [
            'driver' => 'redis',
            'connection' => 'cache',
        ],
    ],
];

A 'connection' => 'default',

B 'connection' => 'redis',

C 'connection' => 'cache',

D 'connection' => 'database',

💡 Hint

Check the default Redis connection name used for caching in Laravel.

Laravel uses the Redis connection named 'cache' for caching by default, which is separate from the default Redis connection.

🔧 Debug

advanced

Debugging Cache Store Not Found Error

You get an error: Cache store [memcached] is not defined. What is the most likely cause?

A The memcached store is not configured in config/cache.php stores array.

B The cache driver is set to 'file' but memcached is used in code.

C The memcached PHP extension is not installed or enabled.

D The Redis server is down causing fallback to memcached.

💡 Hint

Check the cache stores configuration for memcached.

This error means Laravel cannot find a cache store named 'memcached' in the configuration. It must be defined in the stores array.

❓ state_output

expert

Cache Expiration Behavior

Given this Laravel cache code:

Cache::put('key', 'value', 10);
$value = Cache::get('key');

What is the value of $value immediately after running this code?

Laravel

Cache::put('key', 'value', 10);
$value = Cache::get('key');

A An empty string

B null

C Throws an exception

D 'value'

💡 Hint

Consider the cache expiration time and when you retrieve the value.

The cache expiration time is 10 minutes, so immediately after putting the value, it is available and returned as 'value'.