MessageHelper::getNumberDeclension

static function getNumberDeclension($number, $nominative, $genitiveSingular, $genitivePlural)
{
	$number = intval($number);
	if($number === 0)
	{
		return $genitivePlural;
	}

	if($number < 0)
	{
		$number = -$number;
	}

	$lastDigit = $number % 10;
	$penultimateDigit = (($number % 100) - $lastDigit) / 10;

	if ($lastDigit === 1 && $penultimateDigit !== 1)
	{
		return $nominative;
	}

	return ($penultimateDigit !== 1 && $lastDigit >= 2 && $lastDigit <= 4)
		? $genitiveSingular : $genitivePlural;
}