How to "like" a facebook group using the PHP SDK?

Question

Facebook

Hello everyone )
There was a need to learn how to "like" and share using facebook php sdk
, well, I learned how to do share, but I can’t understand how to like a group at all (
there is a publish_action allowed in the arsenal
, I would be very grateful for the source code in php, but if it's difficult / stressful - I'll manage with a link
about facebook's docks - the worst docks, as for me ....
rummaged through everything, found a bunch of information on the like - but I just got confused ....
in general, I ask for help,
the project is on fire)