Understanding the Relationship Between .env Files and Config Directory in Laravel

Many developers get confused between the .env file and the configuration files in Laravel's config directory; this article examines their relationship and how values are resolved.

The documentation states that all configuration files reside in the config directory, but the root .env file provides environment‑specific values. When a configuration entry uses the env() helper, Laravel first looks for the variable in .env ; if it exists, that value is used, otherwise the default defined in the config file is applied.

Example of a typical .env entry and its corresponding config entry:

# .env file
APP_NAME=Laravel
…
# config/app.php
'name' => env('APP_NAME', 'Laravel'),

To verify this behavior, the author runs the test code:

return config('app.name');

Changing APP_NAME in .env to boy and the default in app.php to girl initially still returns Laravel until the developer restarts the server with php artisan serve . After the restart, the returned value becomes boy , confirming that modifications to .env are not reflected until the application is restarted.

Further testing shows that if the variable is removed from .env , the default value from the config file ( girl ) is used. Changing that default to girl1 and restarting updates the result accordingly.

Key takeaways:

If a config entry uses env() , Laravel prefers the value from .env when present; otherwise it falls back to the config file's default.

Changes to values defined in .env do not take effect immediately; a restart of the PHP development server (or clearing the configuration cache) is required.