Python to php laraval from?

Hello guys, I need some help python code to php laraval from.

@classmethod
    def referral_reward(self, userid: int, reward: int ) -> bool:
        '''Add user referral reward'''
        user = self.user_exist(userid)
        if user:
            user.balance = user.balance + reward
            user.referral_count = user.referral_count + 1 
            user.save()
        return True

Please help me with convert python sample code to php laraval.