Conversion of number to one of the countable forms in russian

gistfile1.txt

function num2MultipleRus($int){
  $str=strval($int);
	$fin=$str[strlen($str)-1];

	if ($fin==1) return 1;
	elseif ($fin>1 && $fin<5) return 2;
	elseif ($fin>4) return 3;
}