getFunctionNode example

break;

                    case 'none':
                    case 'NONE':
                    case 'null':
                    case 'NULL':
                        $node = new ConstantExpression(null, $token->getLine());
                        break;

                    default:
                        if ('(' === $this->parser->getCurrentToken()->getValue()) {
                            $node = $this->getFunctionNode($token->getValue(), $token->getLine());
                        } else {
                            $node = new NameExpression($token->getValue(), $token->getLine());
                        }
                }
                break;

            case /* Token::NUMBER_TYPE */ 6:
                $this->parser->getStream()->next();
                $node = new ConstantExpression($token->getValue(), $token->getLine());
                break;