How to set .env values in laravel programmatically on the fly

Question

I have a custom CMS that I am writing from scratch in Laravel and want to set env values i.e. database details, mailer details, general configuration, etc from

Answer 1

Tailor Otwell generate the laravel application key and set its value using this code (code modified for example purpose):

$escaped = preg_quote('='.config('broadcasting.default'), '/');

file_put_contents(app()->environmentFilePath(), preg_replace("/^BROADCAST_DRIVER{$escaped}/m", 'BROADCAST_DRIVER='.'pusher',
        file_get_contents(app()->environmentFilePath())
));

You can find the code in the key generation class: Illuminate\Foundation\Console\KeyGenerateCommand