OCA\Richdocuments\Db\Op::removeMember PHP Method

    public function removeMember($esId, $memberId)
    {
        $op = array('optype' => 'RemoveMember', 'memberid' => (string) $memberId, 'timestamp' => $this->getMillisecondsAsString());
        $this->insertOp($esId, $memberId, $op);
    }

 private function disconnect($memberId, $esId)
 {
     $member = new Db\Member();
     $member->loadBy('member_id', $memberId);
     if ($esId && $member->hasData()) {
         if ($member->getEsId() === $esId && $member->getStatus() == Db\Member::MEMBER_STATUS_ACTIVE) {
             $member->deactivate(array($memberId));
             $op = new Db\Op();
             $op->removeMember($esId, $memberId);
         }
     }
     return array('status' => 'success');
 }