Bug #67348 [Com]: Reading $dbc->stat modifies $dbc->affected_rows

Edit report at https://bugs.php.net/bug.php?id=67348&edit=1 ID: 67348 Comment by: chealer at gmail dot com Reported by: derick@php.net Summary: Reading $dbc->stat modifies $dbc->affected_rows Status: Open Type: Bug Package: MySQLi related Operating System: Linux PHP Version: 5.6Git-2014-05-27 (Git) Block user comment: N Private report: N New Comment: This is a recipe to make a developer crazy. You hit a bug in your code, add breakpoints to try debugging it, and get crazy results. I can't believe this persists. I am experiencing this under PHP 5.5.12. This was reported by figiemmi to NetBeans Forums on 2012-11-24, but he did not specify which PHP version he was using. This is visibly an old bug, but it's hard to believe it's always been that way. This was also reported against NetBeans: https://netbeans.org/bugzilla/show_bug.cgi?id=244714 Thank you very much for reporting, your test case and your analysis, Derick. Previous Comments: ------------------------------------------------------------------------ [2015-06-21 21:31:29] stephan dot eicher at check24 dot de We are affected by this bug and it's very important for us because our framework relies on valid return values for "affected_rows". We can reproduce this issue on Debian Jessie with package php5 (5.6.x) and xdebug installed. ------------------------------------------------------------------------ [2014-05-27 22:31:58] derick@php.net Description: ------------ When a script reads $dbc->stat, subsequent reads of $dbc->affected_rows return a different result. This was first reported to me as Xdebug bug #1053: http://bugs.xdebug.org/view.php?id=1053. I traced this back to the reading of ->stat as follows: - Xdebug's debugging command "context_get" reads all the variables in the local scope - For each object variable, the debug handlers are called (through Z_OBJDEBUG_PP): https://github.com/derickr/xdebug/blob/master/xdebug_var.c#L1725 - MySQLi debug handler loops over a list of properties: https://github.com/php/php-src/blob/master/ext/mysqli/mysqli_prop.c#L449 - The debug handler for affected_rows is at https://github.com/php/php-src/blob/master/ext/mysqli/mysqli_prop.c#L158 - The debug handler for stat is at https://github.com/php/php-src/blob/master/ext/mysqli/mysqli_prop.c#L256 - The debug handler for stat is defined at https://github.com/php/php-src/blob/master/ext/mysqlnd/mysqlnd.h#L212 - When I do *not* call "$foo = $dbc->stat", everything works. - I can not created a work around, because the debug handler loops over all properties, and I have no chance to prevent ->stat from being read from the Xdebug side. Test script: --------------- <?php $dbc = mysqli_connect('localhost', 'root', 'passwd', 'test'); $q = "INSERT INTO test1053 VALUES(7)"; $r = mysqli_query($dbc, $q); var_dump($dbc->affected_rows); $foo = $dbc->stat; var_dump($dbc->affected_rows); ?> Expected result: ---------------- int(1) int(1) Actual result: -------------- int(1) int(-1) ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=67348&edit=1