src/Birthday/Birthday.php
public static function validate($birthday): array
    {
        $date = strtotime($birthday);

        if ($date === false) {
            throw new \InvalidArgumentException("Invalid birthday: $birthday");
        }

        $year = date('Y', $date);
        $month = date('n', $date);
        $day = date('j', $date);
        $currentYear = date('Y');

        if ($year > $currentYear || $year <= $currentYear - self::MAX_AGE) {
            throw new \OutOfRangeException('The age is out of range [0, 200)');
        }

        return ['year' => $year, 'month' => $month, 'day' => $day];
    }
public static function validate($birthday): array
    {
        $date = strtotime($birthday);

        if ($date === false) {
            throw new \InvalidArgumentException("Invalid birthday: $birthday");
        }

        $year = date('Y', $date);
        $month = date('n', $date);
        $day = date('j', $date);
        $currentYear = date('Y');

        if ($year > $currentYear || $year <= $currentYear - self::MAX_AGE) {
            throw new \OutOfRangeException('The age is out of range [0, 200)');
        }

        return ['year' => $year, 'month' => $month, 'day' => $day];
    }
Validate birthday, if it is valid then return the birth year, month and day

@param  string                      $birthday
@throws \InvalidArgumentException
@throws \OutOfRangeException
@return array