PHP bcceil, bcfloor and bcround for bcmath

bcmath.php

<?php
declare(strict_types=1);

// https://stackoverflow.com/a/1653826
// updated for PHP 8

function bcceil(string $number): string
{
    if (str_contains($number, '.')) {
        if (preg_match("~\.[0]+$~", $number)) {
            return bcround($number, 0);
        }
        if ($number[0] !== '-') {
            return bcadd($number, '1', 0);
        }
        return bcsub($number, '0', 0);
    }
    return $number;
}

function bcfloor(string $number): string
{
    if (str_contains($number, '.')) {
        if (preg_match("~\.[0]+$~", $number)) {
            return bcround($number, 0);
        }
        if ($number[0] != '-') {
            return bcadd($number, '0', 0);
        }
        return bcsub($number, '1', 0);
    }
    return $number;
}

function bcround(string $number, int $precision = 0): string
{
    if (str_contains($number, '.')) {
        if ($number[0] != '-') {
            return bcadd($number, '0.' . str_repeat('0', $precision) . '5', $precision);
        }
        return bcsub($number, '0.' . str_repeat('0', $precision) . '5', $precision);
    }
    return $number;
}


assert(bcceil('.2') == ceil(.2));
assert(bcceil('4') == ceil(4));
assert(bcceil('4.3') == ceil(4.3));
assert(bcceil('9.999') == ceil(9.999));
assert(bcceil('-3.14') == ceil(-3.14));

assert(bcfloor('.2') == floor(.2));
assert(bcfloor('4') == floor(4));
assert(bcfloor('4.3') == floor(4.3));
assert(bcfloor('9.999') == floor(9.999));
assert(bcfloor('-3.14') == floor(-3.14));

assert(bcround('.2', 0) == number_format(.2, 0));
assert(bcround('3', 0) == number_format(3, 0));
assert(bcround('3.4', 0) == number_format(3.4, 0));
assert(bcround('3.5', 0) == number_format(3.5, 0));
assert(bcround('3.6', 0) == number_format(3.6, 0));
assert(bcround('.245', 2) == number_format(.245, 2));
assert(bcround('.255', 2) == number_format(.255, 2));
assert(bcround('1.95583', 2) == number_format(1.95583, 2));
assert(bcround('5.045', 2) == number_format(5.045, 2));
assert(bcround('5.055', 2) == number_format(5.055, 2));
assert(bcround('9.999', 2) == number_format(9.999, 2));