DotEnv example

if (! $this->writeNewEnvironmentToEnvFile($env)) {
            CLI::error('Error in writing new environment to .env file.', 'light_gray', 'red');
            CLI::newLine();

            return;
        }

        // force DotEnv to reload the new environment         // however we cannot redefine the ENVIRONMENT constant         putenv('CI_ENVIRONMENT');
        unset($_ENV['CI_ENVIRONMENT'], $_SERVER['CI_ENVIRONMENT']);
        (new DotEnv(ROOTPATH))->load();

        CLI::write(sprintf('Environment is successfully changed to "%s".', $env), 'green');
        CLI::write('The ENVIRONMENT constant will be changed in the next script execution.');
        CLI::newLine();
    }

    /** * @see https://regex101.com/r/4sSORp/1 for the regex in action */
    private function writeNewEnvironmentToEnvFile(string $newEnv): bool
    {
        

// Initialize and register the loader with the SPL autoloader stack. Services::autoloader()->initialize(new Autoload(), new Modules())->register();

// Now load Composer's if it's available if (is_file(COMPOSER_PATH)) {
    require_once COMPOSER_PATH;
}

// Load environment settings from .env files into $_SERVER and $_ENV require_once SYSTEMPATH . 'Config/DotEnv.php';

$env = new DotEnv(ROOTPATH);
$env->load();

// Always load the URL helper, it should be used in most of apps. helper('url');

Services::routes()->loadRoutes();

// This is the line that might need to be changed, depending on your folder structure. require FCPATH . '../app/Config/Paths.php';
// ^^^ Change this line if you move your application folder
$paths = new Config\Paths();

// Location of the framework bootstrap file. require rtrim($paths->systemDirectory, '\\/ ') . DIRECTORY_SEPARATOR . 'bootstrap.php';

// Load environment settings from .env files into $_SERVER and $_ENV require_once SYSTEMPATH . 'Config/DotEnv.php';
(new CodeIgniter\Config\DotEnv(ROOTPATH))->load();

// Define ENVIRONMENT if (! defined('ENVIRONMENT')) {
    define('ENVIRONMENT', env('CI_ENVIRONMENT', 'production'));
}

// Load Config Cache // $factoriesCache = new \CodeIgniter\Cache\FactoriesCache(); // $factoriesCache->load('config'); // ^^^ Uncomment these lines if you want to use Config Caching.

if (! $this->setNewEncryptionKey($encodedKey, $params)) {
            CLI::write('Error in setting new encryption key to .env file.', 'light_gray', 'red');
            CLI::newLine();

            return;
        }

        // force DotEnv to reload the new env vars         putenv('encryption.key');
        unset($_ENV['encryption.key'], $_SERVER['encryption.key']);
        $dotenv = new DotEnv(ROOTPATH);
        $dotenv->load();

        CLI::write('Application\'s new encryption key was successfully set.', 'green');
        CLI::newLine();
    }

    /** * Generates a key and encodes it. */
    protected function generateRandomKey(string $prefix, int $length): string
    {