OCA\Richdocuments\Db\Session::syncOps PHP Method

    public function syncOps($memberId, $currentHead, $clientHead, $clientOps)
    {
        $hasOps = count($clientOps) > 0;
        $op = new \OCA\Richdocuments\Db\Op();
        // TODO handle the case ($currentHead == "") && ($seqHead != "")
        if ($clientHead == $currentHead) {
            // matching heads
            if ($hasOps) {
                // incoming ops without conflict
                // Add incoming ops, respond with a new head
                $newHead = \OCA\Richdocuments\Db\Op::addOpsArray($this->getEsId(), $memberId, $clientOps);
                $result = array('result' => 'added', 'head_seq' => $newHead ? $newHead : $currentHead);
            } else {
                // no incoming ops (just checking for new ops...)
                $result = array('result' => 'new_ops', 'ops' => array(), 'head_seq' => $currentHead);
            }
        } else {
            // HEADs do not match
            $result = array('result' => $hasOps ? 'conflict' : 'new_ops', 'ops' => $op->getOpsAfterJson($this->getEsId(), $clientHead), 'head_seq' => $currentHead);
        }
        return $result;
    }