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

Replace single value in .env file function:

/**
 * @param string $key
 * @param string $value
 * @param null $env_path
 */
function set_env(string $key, string $value, $env_path = null)
{
    $value = preg_replace('/\s+/', '', $value); //replace special ch
    $key = strtoupper($key); //force upper for security
    $env = file_get_contents(isset($env_path) ? $env_path : base_path('.env')); //fet .env file
    $env = str_replace("$key=" . env($key), "$key=" . $value, $env); //replace value
    /** Save file eith new content */
    $env = file_put_contents(isset($env_path) ? $env_path : base_path('.env'), $env);
}

Example to local (laravel) use: set_env('APP_VERSION', 1.8).

Example to use custom path: set_env('APP_VERSION', 1.8, $envfilepath).