REBELinBLUE\Deployer\Console\Commands\UpdateApp::updateConfiguration PHP Method

    protected function updateConfiguration()
    {
        $config = [];
        // Read the current config values into an array for the writeEnvFile method
        foreach (file(base_path('.env')) as $line) {
            $line = trim($line);
            if (empty($line)) {
                continue;
            }
            $parts = explode('=', $line);
            if (count($parts) < 2) {
                continue;
            }
            $env = strtolower($parts[0]);
            $value = trim($parts[1]);
            $section = substr($env, 0, strpos($env, '_'));
            $key = substr($env, strpos($env, '_') + 1);
            $config[$section][$key] = $value;
        }
        // JWT secret needs to be generated if it is not already set
        if (!isset($config['jwt']) || $config['jwt']['secret'] === 'changeme') {
            $config['jwt']['secret'] = $this->generateJWTKey();
        }
        // Backup the .env file, just in case it failed because we don't want to lose APP_KEY
        copy(base_path('.env'), base_path('.env.prev'));
        // Copy the example file so that new values are copied
        copy(base_path('.env.example'), base_path('.env'));
        // Write the file to disk
        $this->writeEnvFile($config);
        // If the updated .env is the same as the backup remove the backup
        if (md5_file(base_path('.env')) === md5_file(base_path('.env.prev'))) {
            unlink(base_path('.env.prev'));
        }
    }