src/Math.php
final private static function bcRoundHalfUp($number, $precision)
    {
        return self::truncate(bcadd($number, self::getHalfUpValue($number, $precision), $precision + 1), $precision);
    }
final private static function bcRoundHalfUp($number, $precision)
    {
        return self::truncate(bcadd($number, self::getHalfUpValue($number, $precision), $precision + 1), $precision);
    }
final private static function bcRoundHalfUp ( $ number , $ precision ) { return self :: truncate ( bcadd ( $ number , self :: getHalfUpValue ( $ number , $ precision ) , $ precision + 1 ) , $ precision ) ; }
Round decimals from 5 up, less than 5 down

@param $number
@param $precision

@return string
Round decimals from 5 up less than 5 down