Active.
Phil went to a movie with his friends.
Phil is the subject
went to is the verb
a movie is the object
Active voice is subject + verb + object
Passive voice is object + verb to be + verb (past participle) + subject
The sentence in passive voice:
A movie was gone to by Phil and his friends.
A movie is the object
was gone to is the verb
Phil and his friends is the subject
However, people are usually more important so they should be mentioned first.