Ratchet\WebSocket\Version\RFC6455::onMessage PHP Method

    public function onMessage(ConnectionInterface $from, $data)
    {
        $overflow = '';
        if (!isset($from->WebSocket->message)) {
            $from->WebSocket->message = $this->newMessage();
        }
        // There is a frame fragment attached to the connection, add to it
        if (!isset($from->WebSocket->frame)) {
            $from->WebSocket->frame = $this->newFrame();
        }
        $from->WebSocket->frame->addBuffer($data);
        if ($from->WebSocket->frame->isCoalesced()) {
            $frame = $from->WebSocket->frame;
            if (false !== $frame->getRsv1() || false !== $frame->getRsv2() || false !== $frame->getRsv3()) {
                return $from->close($frame::CLOSE_PROTOCOL);
            }
            if (!$frame->isMasked()) {
                return $from->close($frame::CLOSE_PROTOCOL);
            }
            $opcode = $frame->getOpcode();
            if ($opcode > 2) {
                if ($frame->getPayloadLength() > 125 || !$frame->isFinal()) {
                    return $from->close($frame::CLOSE_PROTOCOL);
                }
                switch ($opcode) {
                    case $frame::OP_CLOSE:
                        $closeCode = 0;
                        $bin = $frame->getPayload();
                        if (empty($bin)) {
                            return $from->close();
                        }
                        if (strlen($bin) >= 2) {
                            list($closeCode) = array_merge(unpack('n*', substr($bin, 0, 2)));
                        }
                        if (!$this->isValidCloseCode($closeCode)) {
                            return $from->close($frame::CLOSE_PROTOCOL);
                        }
                        if (!$this->validator->checkEncoding(substr($bin, 2), 'UTF-8')) {
                            return $from->close($frame::CLOSE_BAD_PAYLOAD);
                        }
                        $frame->unMaskPayload();
                        return $from->close($frame);
                        break;
                    case $frame::OP_PING:
                        $from->send($this->newFrame($frame->getPayload(), true, $frame::OP_PONG));
                        break;
                    case $frame::OP_PONG:
                        break;
                    default:
                        return $from->close($frame::CLOSE_PROTOCOL);
                        break;
                }
                $overflow = $from->WebSocket->frame->extractOverflow();
                unset($from->WebSocket->frame, $frame, $opcode);
                if (strlen($overflow) > 0) {
                    $this->onMessage($from, $overflow);
                }
                return;
            }
            $overflow = $from->WebSocket->frame->extractOverflow();
            if ($frame::OP_CONTINUE == $frame->getOpcode() && 0 == count($from->WebSocket->message)) {
                return $from->close($frame::CLOSE_PROTOCOL);
            }
            if (count($from->WebSocket->message) > 0 && $frame::OP_CONTINUE != $frame->getOpcode()) {
                return $from->close($frame::CLOSE_PROTOCOL);
            }
            $from->WebSocket->message->addFrame($from->WebSocket->frame);
            unset($from->WebSocket->frame);
        }
        if ($from->WebSocket->message->isCoalesced()) {
            $parsed = $from->WebSocket->message->getPayload();
            unset($from->WebSocket->message);
            if (!$this->validator->checkEncoding($parsed, 'UTF-8')) {
                return $from->close(Frame::CLOSE_BAD_PAYLOAD);
            }
            $from->WebSocket->coalescedCallback->onMessage($from, $parsed);
        }
        if (strlen($overflow) > 0) {
            $this->onMessage($from, $overflow);
        }
    }