PHPOffice / PhpSpreadsheet

            return Functions::VALUE();

        }

        $characters = Functions::flattenSingleValue($characters);

        if (is_bool($characters)) {

            if (Functions::getCompatibilityMode() == Functions::COMPATIBILITY_OPENOFFICE) {

                $characters = (int) $characters;

            } else {

                $characters = ($characters) ? \PhpOffice\PhpSpreadsheet\Calculation::getTRUE() : \PhpOffice\PhpSpreadsheet\Calculation::getFALSE();

            }

        }

        $character = $characters;

        if ((function_exists('mb_strlen')) && (function_exists('mb_substr'))) {

        // Loop through arguments

        $aArgs = Functions::flattenArray(func_get_args());

        foreach ($aArgs as $arg) {

            if (is_bool($arg)) {

                if (Functions::getCompatibilityMode() == Functions::COMPATIBILITY_OPENOFFICE) {

                    $arg = (int) $arg;

                } else {

                    $arg = ($arg) ? \PhpOffice\PhpSpreadsheet\Calculation::getTRUE() : \PhpOffice\PhpSpreadsheet\Calculation::getFALSE();

                }

            }

            $returnValue .= $arg;

        }