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Bug #64038 number_format isn't correct with big numbers
Submitted: 2013-01-21 16:04 UTC Modified: 2013-01-21 18:37 UTC
From: nicolas dot giraud at actiane dot com Assigned:
Status: Not a bug Package: Unknown/Other Function
PHP Version: Irrelevant OS:
Private report: No CVE-ID: None
View Developer Edit
 [2013-01-21 16:04 UTC] nicolas dot giraud at actiane dot com 
Description:
------------
The number_format function don't give the good result with good format, maybe 
because of cast in float that kills precision.


Test script:
---------------
<?php
$number = '123456789012345678901234567890';
$formatted = number_format($number, 2, '.', ' ');
echo $formatted;

?>

Expected result:
----------------
123 456 789 012 345 678 901 234 567 890.00

Actual result:
--------------
123 456 789 012 345 660 285 533 552 640.00

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 [2013-01-21 16:18 UTC] rasmus@php.net
-Status: Open +Status: Not a bug
 [2013-01-21 16:18 UTC] rasmus@php.net 
Not much we can do about that. number_format() takes a float and you are 
overflowing a float with your huge value. Since you already have it as a string, 
you could just throw a regex at it. Something like:
 preg_replace("/(?<=\d)(?=(\d{3})+(?!\d))/",",",$number);
 [2013-01-21 18:24 UTC] nicolas dot giraud at actiane dot com 
Why number_format can't accept a mixed value?
Cast into a string and parse it correctly, it would be quicker as using regexp...
And when expected result is not the same as actual result, it's a bug, isn't it?
 [2013-01-21 18:37 UTC] rasmus@php.net 
No, it isn't a bug because the function is documented to take a float. So it is 
behaving exactly as documented. And no, it can't take a mixed type because in 
order to do the rounding that it supports, it needs to work with a numeric type.
 
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