PHPOffice / PhpSpreadsheet

        $worksheetNames = [];

        while ($xml->read()) {

            if ($xml->name == 'gnm:SheetName' && $xml->nodeType == XMLReader::ELEMENT) {

                $xml->read(); //    Move onto the value node

                $worksheetNames[] = (string) $xml->value;

            } elseif ($xml->name == 'gnm:Sheets') {

                //    break out of the loop once we've got our sheet names rather than parse the entire file

                break;

            }

        }

        return $worksheetNames;

                        $xml->read(); //    Move onto the value node

                        $tmpInfo['lastColumnIndex'] = (int) $xml->value;

                        $tmpInfo['totalColumns'] = (int) $xml->value + 1;

                    } elseif ($xml->name == 'gnm:MaxRow' && $xml->nodeType == XMLReader::ELEMENT) {

                        $xml->read(); //    Move onto the value node

                        $tmpInfo['totalRows'] = (int) $xml->value + 1;

                        break;

                    }

                }

                $tmpInfo['lastColumnLetter'] = \PhpOffice\PhpSpreadsheet\Cell::stringFromColumnIndex($tmpInfo['lastColumnIndex']);

                $worksheetInfo[] = $tmpInfo;