StackFormation\Diff::loadOriginalEnvVars PHP Method

    protected function loadOriginalEnvVars(Stack $stack)
    {
        $vars = $stack->getUsedEnvVars();
        foreach ($vars as $var => $value) {
            $string = "{$var}={$value}";
            // echo "Loading env var: $string\n";
            putenv($string);
        }
    }