protected function getPayloadOffset()
    {
        if (!isset($this->offset_payload)) {
            $offset = $this->getMaskOffset();
            $offset += $this->getMaskSize();

            $this->offset_payload = $offset;
        }
        return $this->offset_payload;
    }
protected function getPayloadOffset()
    {
        if (!isset($this->offset_payload)) {
            $offset = $this->getMaskOffset();
            $offset += $this->getMaskSize();

            $this->offset_payload = $offset;
        }
        return $this->offset_payload;
    }
protected function getPayloadOffset ( ) { if ( ! isset ( $ this -> offset_payload ) ) { $ offset = $ this -> getMaskOffset ( ) ; $ offset += $ this -> getMaskSize ( ) ; $ this -> offset_payload = $ offset ; } return $ this -> offset_payload ; }
Gets the offset of the payload in the frame

@return int
Gets the offset of the payload in the frame