Method append

text-to-qr/lib/phpqrcode/phpqrcode.php:1837–1855

----------------------------------------------------------------------

(QRbitstream $arg)

        
        //----------------------------------------------------------------------
        public function append(QRbitstream $arg)
        {
            if (is_null($arg)) {
                return -1;
            }
            
            if($arg->size() == 0) {
                return 0;
            }
            
            if($this->size() == 0) {
                $this->data = $arg->data;
                return 0;
            }
            
            $this->data = array_values(array_merge($this->data, $arg->data));

            return 0;
        }
        
        //----------------------------------------------------------------------
        public function appendNum($bits, $num)