Environment configuration in Laravel - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of the .env file in Laravel?

The .env file stores environment-specific settings like database credentials, app debug mode, and API keys. It helps keep sensitive data out of the code and allows easy changes per environment (local, production).

beginner

How does Laravel access environment variables in code?

Laravel uses the env('KEY') helper function to read values from the .env file. For example, env('APP_DEBUG') returns the debug mode setting.

beginner

Why should the .env file not be committed to version control?

The .env file contains sensitive information like passwords and API keys. Committing it risks exposing secrets publicly. Instead, each environment should have its own .env file kept private.

intermediate

What command should you run after changing the .env file to apply changes?

Run php artisan config:cache to clear and cache the configuration. This makes Laravel reload environment variables and config settings for better performance.

intermediate

How can you set a default value when accessing an environment variable in Laravel?

Use the second argument of the env() helper as a default. For example, env('APP_ENV', 'production') returns 'production' if APP_ENV is not set.

What file in Laravel holds environment-specific settings?

A .env

B config.php

C routes/web.php

D app.php

The .env file stores environment-specific settings like database credentials and app modes.

Which Laravel helper function reads environment variables?

A config()

B app()

C env()

D route()

The env() helper reads values from the .env file.

Why should the .env file be excluded from version control?

A It contains large files

B It slows down the app

C It is auto-generated

D It contains sensitive data

The .env file contains sensitive data like passwords and API keys that should not be public.

What command updates Laravel config cache after .env changes?

A php artisan migrate

B php artisan config:cache

C php artisan serve

D php artisan route:cache

php artisan config:cache clears and caches config including environment variables.

How do you provide a default value when using env()?

A env('KEY', 'default')

B env('KEY')

C env('default', 'KEY')

D env('KEY').default

The second argument of env() is the default value if the key is missing.

Explain how Laravel uses the .env file for environment configuration and why it is important.

Think about how apps change between local and production.

Describe the steps to update Laravel configuration after modifying the .env file.

Consider the artisan command for config caching.