John Stamos -- Out of Rehab ... I'm Into Punch Now (PHOTO)

John Stamos is still a fighter after completing a sting in rehab for substance abuse.

John spent 30-days in a live-in facility after his DUI arrest in Bev Hills last month. As we reported, we were told he had substance abuse issues that developed over a substantial period of time.

Stamos was so messed up when he was arrested he was rushed to the hospital.

It looks like rehab did him good. Welcome back, John.