Vendor/phpspreadsheet/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Writer/Xls/Worksheet.php
private function writeDefcol()
    {
        $defaultColWidth = 8;

        $record = 0x0055; // Record identifier
        $length = 0x0002; // Number of bytes to follow

        $header = pack('vv', $record, $length);
        $data = pack('v', $defaultColWidth);
        $this->append($header . $data);
    }
private function writeDefcol()
    {
        $defaultColWidth = 8;

        $record = 0x0055; // Record identifier
        $length = 0x0002; // Number of bytes to follow

        $header = pack('vv', $record, $length);
        $data = pack('v', $defaultColWidth);
        $this->append($header . $data);
    }
Write BIFF record DEFCOLWIDTH if COLINFO records are in use.