Round up numbers - php

Question

I get some numbers from database. I would like round up these numbers this way:
Database => Round up number
34 => 0
89 => 100
421 => 400
561 => 600
4421 => 4000
6701 => 7000
45000 => 50000
91000 => 90000
132000 => 130000
Is there any php function to do this? So numbers under 1000 would be round up closest full 100. Over thousands would be rounded up to nearest full 1000 figure. And if number is over 10 000 then it would be always rounded up to closest full 10 000.
Hopefully you understand what I'm after.

Answer 1

Since I'm fed up of people not reading the damn question...
function myRound(int $number) : int {
// remove typehints if you're on old versions of PHP...
$magnitude = abs($number);
if( $magnitude < 1000) $precision = -2;
elseif( $magnitude < 10000) $precision = -3;
else $precision = -4;
return round($number,$precision);
}
IDEOne test

Answer 2

You can use some simple math(mostly to calc num length) and build in with negative precision round() function
function customRound($number) {
return round($number, -floor(log10($number)));
}
echo customRound(6701); // sample of usage
-floor(log10($number)) this part is to calc length of num - 1 and also it is negated for round() needs

Answer 3

Have a look at the round() function here
http://php.net/manual/en/function.round.php
and the ceil() function here
http://php.net/manual/en/function.ceil.php
Something like
$number = 1;
$number = ceil($number / 10) * 10;
echo $number;

Answer 4

Here is one solution:
$numbers = [
34,
89,
421,
561,
4421,
6701,
45000,
91000,
132000
];
foreach ($numbers as $number) {
$len = strlen((string)$number);
$precision = $len - 1;
$precision = $len <= 2 ? 2 : $precision;
$precision = $len > 4 ? 4 : $precision;
echo $number . ' => '. round($number, -1 * $precision) . PHP_EOL;
}
Outputs:
34 => 0
89 => 100
421 => 400
561 => 600
4421 => 4000
6701 => 7000
45000 => 50000
91000 => 90000
132000 => 130000

Answer 5

You can use a function like this:
$number = 45000;
function rounder($num)
{
$length = strlen($num);
if(is_int($num))
{
if($num < 100)
return round($num, -($length));
elseif($num < 1000 || $num <= 9999)
return round($num, -($length-1));
else
return round($num, -4);
}
}
echo rounder($number);
Though not tested, should work..