Edit report at http://bugs.php.net/bug.php?id=51396&edit=1
ID: 51396 Comment by: codeslinger at compsalot dot com Reported by: codeslinger at compsalot dot com Summary: Math is Unreliable Status: Feedback Type: Bug Package: Math related Operating System: any PHP Version: Irrelevant Assigned To: aharvey New Comment: Thank You for the response. This program executes thousands of identical loops it performs a number format conversion on each of those thousands of numbers in it's array. Out of all of those thousands of identical conversions about 4 of them will produce an invalid result. for this specific program, if I skip the array_merge (see $Nest) then the bug does not occur. Every time I make a change to the loops etc. the behavior changes, even to where the bug is not triggered. I have already simplified this program quite a bit and the result was that it now fails at a totally different array index then when I first observed the problem. The trigger is very finicky. XP is not a factor here, even though the original problem was found on XP, I am running this Snowflake program on Ubuntu Linux. converting a number to a string should never result in that string containing a non-numeric character. I can try to reduce this program further, but really and truly, it is hard to trigger this -- but once triggered it is totally consistent and repeatable. Previous Comments: ------------------------------------------------------------------------ [2010-03-26 10:11:25] [email protected] Btw, it could be due to bad initialized data as well (as you experience it on unix as well). Can you try to run your script under valgrind too? ------------------------------------------------------------------------ [2010-03-26 09:54:33] [email protected] It looks to me in a bug at the number formatting in the Windows API (not php dependent). Other users met this problem on old XP systems. You could reproduce it using number_format only. Or maybe only with a single printf function. Can you try using another windows box or using 5.3.2-vc9 builds? Btw, it is not about bad or good attitude but about having something we can actually use to help you. I can understand your worries after having spent hours to debug this problem, but we will still use a small script to debug this problem, if any. ------------------------------------------------------------------------ [2010-03-26 09:40:23] codeslinger at compsalot dot com did you even LOOOKK at the script that I provided? it is not that complicated. a few loops and some array allocations. previous attempts to reduce this to anything simpler have been unsuccessful. this is exactly the attitude that causes me to be overwrought. ------------------------------------------------------------------------ [2010-03-26 09:30:30] [email protected] Thank you for this bug report. To properly diagnose the problem, we need a short but complete example script to be able to reproduce this bug ourselves. A proper reproducing script starts with <?php and ends with ?>, is max. 10-20 lines long and does not require any external resources such as databases, etc. If the script requires a database to demonstrate the issue, please make sure it creates all necessary tables, stored procedures etc. Please avoid embedding huge scripts into the report. ------------------------------------------------------------------------ [2010-03-26 08:51:34] codeslinger at compsalot dot com oops, fixed. various attempts to isolate this to a simple test case have not yet succeeded. This program is the closest I've come to a simple test case. after many hours of working on this, what I can tell you is that it requires lots of calculations and the use of arrays. - lots of memory allocations. yes, I confess to being overwrought. I've got 3 years of work, and the future of my software company at stake with this bug. and a lot of experience with bug reports that get ignored, including the original entry for this bug. ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at http://bugs.php.net/bug.php?id=51396 -- Edit this bug report at http://bugs.php.net/bug.php?id=51396&edit=1
