phpmyadmin / sql-parser

                } elseif ($token->value === ',') {

                    if ($brackets === 1) {

                        $isCommaLast = true;

                        if (empty($options['type'])) {

                            $ret->raw[] = trim($lastRaw);

                            $ret->values[] = trim($lastValue);

                            $lastRaw = $lastValue = '';

                        }

                    }

                    continue;

                }

        //      (a)  => array('a')

        //

        $lastRaw = trim($lastRaw);

        if ((empty($options['type']))

            && ((strlen($lastRaw) > 0) || ($isCommaLast))

        ) {

            $ret->raw[] = $lastRaw;

            $ret->values[] = trim($lastValue);

        }

        return $ret;

    }