Color::getCodeByNumber

static function getCodeByNumber($number)
{
	$colors = array_keys(self::getColors());

	$number = intval($number);
	if (!$number)
	{
		$code = $colors[mt_rand(0, 9)];
	}
	else
	{
		$number = intval(mb_substr($number.'', -1));
		$number = $number == 0? 9: $number - 1;

		$code = $colors[$number];
	}

	return $code;
}