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

Based on totymedli's answer.

Where it is required to change multiple enviroment variable values at once, you could pass an array (key->value). Any key not present previously will be added and a bool is returned so you can test for success.

public function setEnvironmentValue(array $values)
{

    $envFile = app()->environmentFilePath();
    $str = file_get_contents($envFile);

    if (count($values) > 0) {
        foreach ($values as $envKey => $envValue) {

            $str .= "\n"; // In case the searched variable is in the last line without \n
            $keyPosition = strpos($str, "{$envKey}=");
            $endOfLinePosition = strpos($str, "\n", $keyPosition);
            $oldLine = substr($str, $keyPosition, $endOfLinePosition - $keyPosition);

            // If key does not exist, add it
            if (!$keyPosition || !$endOfLinePosition || !$oldLine) {
                $str .= "{$envKey}={$envValue}\n";
            } else {
                $str = str_replace($oldLine, "{$envKey}={$envValue}", $str);
            }

        }
    }

    $str = substr($str, 0, -1);
    if (!file_put_contents($envFile, $str)) return false;
    return true;

}