Chris Kattan -- Ordered To Take Drug & Booze Classes ... For DUI

Chris Kattan will spend the next 3 years on probation and will have to attend drug and alcohol classes as punishment for driving under the influence of drugs, TMZ has learned.

The L.A. City Attorney's office tells us ... Kattan was also ordered to pay a $500 fine and will have to pay restitution for the freeway crash last Feb. ... when he slammed his Mercedes into a parked Cal Trans vehicle.

Kattan will have to attend a 3-month alcohol program and 104 Narcotics Anonymous classes. Plus, he's forbidden from driving with any drugs in his system ... unless he has a valid prescription.

Law enforcement sources tell TMZ ... Kattan had been driving on Ambien at the time of the crash.