Here are the most sensible pieces of advice that no one on this board seems to agree with:
1. keep your lifting simple and short because it's supposed to be a supplement to your martial arts training, which should be your priority. Look to Stuart McRoberts, John Christy, Dan John, Pavel, etc. Eustress training instead of distress training. Get in and out of the gym fresh and ready to practise your fighting.
2. use your sport for conditioning.
I honestly don't know how people are doing full powerlifting / bodybuilding regimens and training MMA at the same time. I could definitely not do that.
I would say Pavel has the perfect strength program for a fighter: 3-5 lifts for 3-5 sets of 3-5 reps done 3-5 days between workouts with 3-5 minutes rest between sets. Cycle the weights for progress and keep putting up weights while keeping yourself as fresh as possible for fighting.
The lifts I would do:
partial deadlifts
squats
BO rows or pull-downs
dips, bench press or military press
Read more about it here:
https://thoseironguys.wordpress.com/2009/11/06/the-case-for-the-3-5-method/