seed.php

    /**
     * @param int $length
     * @param int $count
     * @return int
     */
    public static function generateSeed($length, $count) : int {
        $prim =  random_int(10**($length-1), (10**($length))-1);
        $sub = (array) str_split($prim);
        for ($i = 0; $i <= count($sub) - 1; $i++) {
            $sub[$i] = (string) $sub[$i]%$count;
        }
        $seed = (int) implode($sub);
        return $seed;
    }