$c1 = new Criteria();
        
        $userCriteria = new Criteria();
        $userCriteria->clearSelectColumns();
        $userCriteria->addSelectColumn(UserPeer::ID);
        $userCriteria->add(UserPeer::TYPE, 5);
        
        $userModel = UserPeer::doSelectRS($userCriteria);



        $c1->add(PostPeer::USER_ID, $userModel, Criteria::IN);
        PostPeer::doDelete($c1);