How to round/ceil/floor a bcmath number in PHP?

Question

Is there any library function for this purpose, so I don\'t do it by hand and risk ending in TDWTF?

echo ceil(31497230840470473074370324734723042.6);

// Exp         


        

Answer 1

OK, for my high-precision Money library, which is currently on hundreds of production sites, I had to completely rewrite this bcround functionality. Nothing I found on the entire Internet was up to code.

Here's what I came up with:

/**
 * Based off of https://stackoverflow.com/a/1653826/430062
 * Thanks, [Alix Axel](https://stackoverflow.com/users/89771/alix-axel)!
 *
 * @param $number
 * @param int $precision
 * @return string
 */
function bcround($number, $precision = BCMathCalcStrategy::PRECISION)
{
    if (strpos($number, '.') !== false) {
        if ($number[0] != '-') return bcadd($number, '0.' . str_repeat('0', $precision) . '5', $precision);
        return bcsub($number, '0.' . str_repeat('0', $precision) . '5', $precision);
    }

    // Pad it out to the desired precision.
    return number_format($number, $precision);
}