Edit report at https://bugs.php.net/bug.php?id=61787&edit=1
ID: 61787
User updated by: ubuntu at spacetrace dot org
Reported by: ubuntu at spacetrace dot org
Summary: money_format round error
Status: Not a bug
Type: Bug
Package: Math related
Operating System: Linux ubuntu 11.04
PHP Version: 5.3.10
Block user comment: N
Private report: N
New Comment:
so why does php round 7.005 down to 7.00 while it rounds 8.005 correctly up to 8.01 ?
and why from 16 on again wrong and from 32 on again correct, from 64 on again wrong but now
not a change from 128 on?
Previous Comments:
------------------------------------------------------------------------
[2012-04-20 16:04:57] johannes@php.net
Floating point values have a limited precision. Hence a value might
not have the same string representation after any processing. That also
includes writing a floating point value in your script and directly
printing it without any mathematical operations.
If you would like to know more about "floats" and what IEEE
754 is, read this:
http://www.floating-point-gui.de/
Thank you for your interest in PHP.
.
------------------------------------------------------------------------
[2012-04-20 13:38:17] ubuntu at spacetrace dot org
Description:
------------
if you round with money_format, some small numbers with 0.005 are rounded down instead of up.
Numbers bigger than 63.5 are all rounded falsly down like with floor()
Test script:
---------------
for($i=0;$i<70;$i++) {
echo($i.'.005 =>'.money_format('%.2i',$i+0.005).'<br>');
if($i<10)
echo($i.'.00500000000000001=>'.money_format('%.2i',$i+0.00500000000000001).'<br>');
}
Expected result:
----------------
0.005 =>0.01
0.00500000000000001=>0.01
1.005 =>1.01
1.00500000000000001=>1.01
2.005 =>2.01
2.00500000000000001=>2.01
3.005 =>3.01
3.00500000000000001=>3.01
4.005 =>4.01
4.00500000000000001=>4.01
5.005 =>5.01
5.00500000000000001=>5.01
6.005 =>6.01
6.00500000000000001=>6.01
7.005 =>7.01
7.00500000000000001=>7.01
8.005 =>8.01
8.00500000000000001=>8.01
9.005 =>9.01
9.00500000000000001=>9.01
10.005 =>10.01
11.005 =>11.01
12.005 =>12.01
13.005 =>13.01
14.005 =>14.01
15.005 =>15.01
16.005 =>16.01
...
Actual result:
--------------
0.00500000000000001=>0.01
1.005 =>1.00
1.00500000000000001=>1.01
2.005 =>2.00
2.00500000000000001=>2.00
3.005 =>3.00
3.00500000000000001=>3.00
4.005 =>4.00
4.00500000000000001=>4.00
5.005 =>5.00
5.00500000000000001=>5.00
6.005 =>6.00
6.00500000000000001=>6.00
7.005 =>7.00
7.00500000000000001=>7.00
8.005 =>8.01
8.00500000000000001=>8.01
9.005 =>9.01
9.00500000000000001=>9.01
10.005 =>10.01
11.005 =>11.01
12.005 =>12.01
13.005 =>13.01
14.005 =>14.01
15.005 =>15.01
16.005 =>16.00
17.005 =>17.00
18.005 =>18.00
19.005 =>19.00
20.005 =>20.00
21.005 =>21.00
22.005 =>22.00
23.005 =>23.00
24.005 =>24.00
25.005 =>25.00
26.005 =>26.00
27.005 =>27.00
28.005 =>28.00
29.005 =>29.00
30.005 =>30.00
31.005 =>31.00
32.005 =>32.01
33.005 =>33.01
34.005 =>34.01
35.005 =>35.01
36.005 =>36.01
37.005 =>37.01
38.005 =>38.01
39.005 =>39.01
40.005 =>40.01
41.005 =>41.01
42.005 =>42.01
43.005 =>43.01
44.005 =>44.01
45.005 =>45.01
46.005 =>46.01
47.005 =>47.01
48.005 =>48.01
49.005 =>49.01
50.005 =>50.01
51.005 =>51.01
52.005 =>52.01
53.005 =>53.01
54.005 =>54.01
55.005 =>55.01
56.005 =>56.01
57.005 =>57.01
58.005 =>58.01
59.005 =>59.01
60.005 =>60.01
61.005 =>61.01
62.005 =>62.01
63.005 =>63.01
64.005 =>64.00
65.005 =>65.00
66.005 =>66.00
67.005 =>67.00
68.005 =>68.00
69.005 =>69.00
from 64 on all numbers are rounded down like floor()
------------------------------------------------------------------------
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Edit this bug report at https://bugs.php.net/bug.php?id=61787&edit=1