number_format inaccurate in PHP

Asked Sep 08 '16 at 10:08

Active Sep 08 '16 at 10:08

Viewed 197 times

PHP function number_format seems to not be reliable for big numbers. It's probably a rounding issue as explained on PHP - number_format issues

The function money_format() behaves similarly.

This is the case:

$n = 1000000000000000001;

echo "\nn = $n";

$nFormat = number_format($n, 0, '.', ',');

echo "\nnFormat = $nFormat";

$nMFormat = money_format('%!i', $n);

echo "\nnMFormat = $nMFormat";

Results are:

n = 1000000000000000001

nFormat = 1,000,000,000,000,000,000

nMFormat = 1000000000000000000.00

Is there a number_format function for big numbers in PHP? Should I code myself? Do I have to deal with big numbers as strings for formatting?

edited Jun 20 '20 at 09:12

Community

asked Sep 08 '16 at 10:08

Juan Ignacio Pérez Sacristán

1

Is your $n being treated as a float, or as an integer? If you're on 32bit PHP, that will exceed max int value, so it will be a float – Mark Baker Sep 08 '16 at 10:19
How do I find that out? PHP is running on Ubuntu server: Ubuntu 14.04.4 LTS (GNU/Linux 3.13.0-77-generic x86_64) – Juan Ignacio Pérez Sacristán Sep 08 '16 at 10:28
PHP_INT_SIZE = 8 PHP_INT_MAX = 9223372036854775807 – Juan Ignacio Pérez Sacristán Sep 08 '16 at 10:31
2

Your answer is here. http://stackoverflow.com/a/6936191/3081659 – Noman Sep 08 '16 at 10:31
I guess I need to use a big integer library http://stackoverflow.com/questions/4427020/is-there-a-biginteger-class-in-php to tackle such big numbers. Thx a lot! – Juan Ignacio Pérez Sacristán Sep 08 '16 at 10:36

number_format inaccurate in PHP

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