在配置文件中加载数据库中的设置

Question

I'm using greggilbert/recaptcha and it uses config file config/recaptcha.php in which recaptcha keys need to be set:

'public_key'    => '',
'private_key'   => '', 

How can I use some values from database for these keys?

When I try to use eloquent in the config file, I'm getting this error:

Call to a member function connection() on a non-object