How to ceil, floor and round bcmath numbers?

Question

I need to mimic the exact functionality of the ceil(), floor() and round() functions on bcmath numbers, I\'ve already found a very similar question but unfo

Answer 1

Only use bcmath functions to do that:

function bcceil($number, $precision = 0) {
    $delta = bcdiv('9', bcpow(10, $precision + 1), $precision + 1);
    $number = bcadd($number, $delta, $precision + 1);
    $number = bcadd($number, '0', $precision);
    return $number;
}

function bcfloor($number, $precision = 0) {
    $number = bcadd($number, '0', $precision);
    return $number;
}

For test:

$numbers = [
    '1', '1.1', '1.4', '1.5', '1.9',
    '1.01', '1.09', '1.10', '1.19', '1.90', '1.99',
    '2'
];

foreach ($numbers as $n) {
    printf("%s (ceil)--> %s\n", $n, bcceil($n, 1));
}

printf("\n");

foreach ($numbers as $n) {
    printf("%s (floor)--> %s\n", $n, bcfloor($n, 1));
}

And the test results:

1 (ceil)--> 1.0
1.1 (ceil)--> 1.1
1.4 (ceil)--> 1.4
1.5 (ceil)--> 1.5
1.9 (ceil)--> 1.9
1.01 (ceil)--> 1.1
1.09 (ceil)--> 1.1
1.10 (ceil)--> 1.1
1.19 (ceil)--> 1.2
1.90 (ceil)--> 1.9
1.99 (ceil)--> 2.0
2 (ceil)--> 2.0

1 (floor)--> 1.0
1.1 (floor)--> 1.1
1.4 (floor)--> 1.4
1.5 (floor)--> 1.5
1.9 (floor)--> 1.9
1.01 (floor)--> 1.0
1.09 (floor)--> 1.0
1.10 (floor)--> 1.1
1.19 (floor)--> 1.1
1.90 (floor)--> 1.9
1.99 (floor)--> 1.9
2 (floor)--> 2.0