print range to count and array

print.php

    /**
     * @param string $range
     * @return string
     */
    public static function cleanRange(string $range): string
    {
        return preg_replace('/[^0-9\-,]/', '', $range);
    }

    /**
     * @param string $strRange
     * @return array
     */
    public static function rangeToArray(string $strRange): array
    {
        $result = [];
        $strRange = self::cleanRange($strRange);
        $arRanges = explode(',', $strRange);
        foreach ($arRanges as $range) {
            if (strpos($range, '-') === false) {
                $result[$range] = $range;
            } else {
                [$first, $second] = explode('-', $range);
                foreach (range($first, $second) as $val) {
                    $result[$val] = $val;
                }
            }
        }
        return $result;
    }

    /**
     * @param string $strRange
     * @return int
     */
    public static function rangeToCount(string $strRange): int
    {
        return count(self::rangeToArray($strRange));
    }