public static function numToWords($num)
{
$num = (int) $num;
// make sure it's an integer
if ($num < 0) {
return Yii::t('kvenum', 'minus') . ' ' . static::convertTri(-$num, 0);
}
if ($num == 0) {
return Yii::t('kvenum', 'zero');
}
return static::convertTri($num, 0);
}