Bug #61612 [Sus]: execution of code is inconsistent

Edit report at https://bugs.php.net/bug.php?id=61612&edit=1 ID: 61612 User updated by: jrsmeets at xs4all dot nl Reported by: jrsmeets at xs4all dot nl Summary: execution of code is inconsistent Status: Suspended Type: Bug Package: Scripting Engine problem Operating System: Linux 2.6.32 Debian PHP Version: 5.3.10 Block user comment: N Private report: N New Comment: Dear Rasmus, I expected that this would be difficult. I've searched this website and I also did some google searches, and I found nothing like these bugs. I'll try to install the application on another machine, which has Linux 2.4.31/Slackware 10.2.0 and PHP 5.2.11. Let's see what happens there. As I said, I've already tried to create the bug in a small script and failed, but maybe in slightly bigger test scripts these bugs will surface. You can keep the ticket in suspended state for a while. And I'll try to report my findings within a few weeks. Previous Comments: ------------------------------------------------------------------------ [2012-04-03 19:53:34] rasmus@php.net Sorry, without some sort of reproducable code snippet I don't see anything to go on here. I can't recall any similar bug reports from anyone either. ------------------------------------------------------------------------ [2012-04-03 19:21:10] jrsmeets at xs4all dot nl Description: ------------ I've been hit several times by what looks like a bug in the the scripting engine, or maybe an over-active post-parsing optimizer. What I see are error messages in my httpd log that make no sense when I inspect the program to check the offending code. Isolating the code in a small script does not replicate these problems: they only occur in the environment of the application I'm working on. Example: # make sure that $n is a numeric scalar if (!isset($n) || !is_numeric($n)) { return $this; } # some code omitted, no changes to $n here if (!isset($testvalue) || !is_array($testvalue) || !array_key_exists($n, $testvalue)) { return $this; } # line 174 And PHP complains thusly in the error log: array_key_exists(): The first argument should be either a string or an integer in [FILENAME.php] on line 174 As you can see: the first argument of array_key_exists() in line 174 is certainly a scalar, so why complain? Another one: $i = $first; # $first is an integer # some code omitted, no changes to $i here while ($i <= $last) { # some code omitted, no changes to $i here $displayName_utf8 = (is_array($displayNames) && array_key_exists($i, $displayNames) && isset($displayNames[$i])) ? bc_utf8($displayNames[$i]) : $i; # some code omitted, no changes to $i here $i ++; } produces this error message: array_key_exists(): The first argument should be either a string or an integer in ... Again this makes no sense: $i is an integer all the way. I've also had problems with code like this if (is_array($a) && is_scalar($k) && array_key_exists($k, $a)) { And PHP complains that the second argument to array_key_exists() must be an array, or in other cases that the first argument should be a string or int, which it is! I've changed code like that to if (isset($a[$k])) { AFAIK, that is almost the same thing, except when $a is an object or $k is set, but not a scalar. Last example: $res = sendMailToUser(); # returns -1, 0 or 1 if ($res == -1) { $errorMessage = 'Action not allowed'; } else if ($res == 0) { $errorMessage = 'Mail could not be sent'; } else { $errorMessage = 'Mail has been sent'; } echo $res.'<br />'; echo $errorMessage.'<br />'; Expected result: any of the three $res values with the corresponding $errorMessage Actual result: 1 Action not allowed Those two values do not belong together. [I'm not making this up.] I've been able to work around most of these issue by changing the code a little bit. Like in the last example, I wrote $res = 0 + sendMailToUser(); and that solved the problem. All of the other issues could also be solved by making this type of ridiculous changes to the code. But that does not solve the underlying issue. And new issues might popup anywhere. My setup: [from phpinfo()] Apache/2.2.16 (Debian) PHP Version 5.3.3-7+squeeze7 [ = 5.3.10] Suhosin Patch 0.9.9.1, with Suhosin v0.9.32.1 Zend Engine v2.3.0 System Linux 2.6.32-5-686 #1 SMP Mon Jan 16 16:04:25 UTC 2012 i686 Build Date Feb 2 2012 18:20:23 Additional .ini files parsed /etc/php5/apache2/conf.d/gd.ini, /etc/php5/apache2/conf.d/imap.ini, /etc/php5/apache2/conf.d/mcrypt.ini, /etc/php5/apache2/conf.d/mysql.ini, /etc/php5/apache2/conf.d/mysqli.ini, /etc/php5/apache2/conf.d/pdo.ini, /etc/php5/apache2/conf.d/pdo_mysql.ini, /etc/php5/apache2/conf.d/suhosin.ini PHP API 20090626 PHP Extension 20090626 Zend Extension 220090626 Zend Extension Build API220090626,NTS PHP Extension Build API20090626,NTS Debug Build no Thread Safety disabled Zend Memory Manager enabled Zend Multibyte Support disabled IPv6 Support enabled Registered PHP Streams https, ftps, compress.zlib, compress.bzip2, php, file, glob, data, http, ftp, phar, zip Registered Stream Socket Transports tcp, udp, unix, udg, ssl, sslv3, sslv2, tls Registered Stream Filters zlib.*, bzip2.*, convert.iconv.*, string.rot13, string.toupper, string.tolower, string.strip_tags, convert.*, consumed, dechunk, mcrypt.*, mdecrypt.* ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=61612&edit=1