LookupRefValidations.php

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<?php

namespace PhpOffice\PhpSpreadsheet\Calculation\LookupRef;

use PhpOffice\PhpSpreadsheet\Calculation\Exception;
use PhpOffice\PhpSpreadsheet\Calculation\Functions;

class LookupRefValidations
{
    public static function validateInt($value): int
    {
        if (!is_numeric($value)) {
            if (Functions::isError($value)) {
                throw new Exception($value);
            }

            throw new Exception(Functions::VALUE());
        }

        return (int) floor((float) $value);
    }

    public static function validatePositiveInt($value, bool $allowZero = true): int
    {
        $value = self::validateInt($value);

        if (($allowZero === false && $value <= 0) || $value < 0) {
            throw new Exception(Functions::VALUE());
        }

        return $value;
    }
}