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] johan...@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() ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=61787&edit=1
