Bug #69693 [Com]: Reproducible Corruption on Variables

Edit report at https://bugs.php.net/bug.php?id=69693&edit=1 ID: 69693 Comment by: bugs at tmarques dot com Reported by: bugs at tmarques dot com Summary: Reproducible Corruption on Variables Status: Feedback Type: Bug Package: *General Issues Operating System: Linux x32 PHP Version: 5.5.25 Block user comment: N Private report: N New Comment: Sure, it's small values. Real code was $i=68 and $l=71, IIRC. You can see the test case on the Gist I posted in the description on the bug. There it returns a float with smaller integers. What should have been 10 or so becomes 9.xx*10^18, something like that. As I mentioned, all code runs fine in i686 but "blows up" on x32 ABI (which is quite useful no virtualized servers). Previous Comments: ------------------------------------------------------------------------ [2015-05-22 22:30:34] danack@php.net "two variables that have integers get summed and return a float." Yes - this is the defined behaviour for when an operation occurs and the result is no longer representable as an integer type. e.g. <?php $x = PHP_INT_MAX; $x += 1; var_dump($x); ?> Will say that $x is a float value. Or to quote from the manual - http://php.net/manual/en/language.types.integer.php "If PHP encounters a number beyond the bounds of the integer type, it will be interpreted as a float instead. Also, an operation which results in a number beyond the bounds of the integer type will return a float instead." If you think the conversion from int to float is occurring inappropriately, please can you provide a simple reproduction case? ------------------------------------------------------------------------ [2015-05-22 18:47:44] bugs at tmarques dot com P.S. I would look into this further but have no idea where to look for the problem or how to debug PHP internal's. Looking for some input and happy to help with testing in any way I can. ------------------------------------------------------------------------ [2015-05-22 18:39:05] bugs at tmarques dot com Description: ------------ This is a bug I ran into when using Wordpress normally. After running a script for a while on a x32 ABI php, it enters an infinite loop that exhausts process memory. Upon investigation, two variables that have integers get summed and return a float. Depending on the input text, the loop doesn't trigger the bug. This doesn't happen on i386/i686, haven't tested on x86-64. Test script: --------------- Please see both examples at: https://gist.github.com/anonymous/4320f460cd1e4144df2a Relevant code is "run.php" from lines 96 to 120. It never triggers if I copy the $text variable to another one that's not even used ($_test). It also returns the correct sum for a test in the code as: if ( is_float( $i + $l ) === TRUE ) So I have to sum and check if the value is big (it usually returns some float of E+18 magnitude). Expected result: ---------------- Integer variables sum and result in an integer. Actual result: -------------- Sum of two integers returns a float. ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=69693&edit=1