Bug #78779 [NoF->Opn]: Null Coalescing Operator: Trying to access array offset on value of type null

Edit report at https://bugs.php.net/bug.php?id=78779&edit=1 ID: 78779 Updated by: cmb@php.net Reported by: bugreport2 at gmail dot com Summary: Null Coalescing Operator: Trying to access array offset on value of type null -Status: No Feedback +Status: Open Type: Bug Package: Scripting Engine problem Operating System: Linux PHP Version: 7.4Git-2019-11-04 (Git) Block user comment: N Private report: N New Comment: Opening, since feedback had been provided. Previous Comments: ------------------------------------------------------------------------ [2019-11-17 04:22:05] php-bugs at lists dot php dot net No feedback was provided. The bug is being suspended because we assume that you are no longer experiencing the problem. If this is not the case and you are able to provide the information that was requested earlier, please do so and change the status of the bug back to "Re-Opened". Thank you. ------------------------------------------------------------------------ [2019-11-05 11:39:36] bugreport2 at gmail dot com it was triggered by a fuzzy-testsuite on two out of millions of calls :-( i replaced the offending code path with a construct used all over the codebase which should silence it as intended i find it interesting that it's even possible that this warning triggers at all when "Null Coalescing Operator" is used because there is no point to look at the array offset when the whole $arr is NULL - $arr = mysqli_fetch_row($db->query($sql)); - $oldcontent = $arr[0] ?? ''; + $oldcontent = (string)(mysqli_fetch_row($db->query($sql))[0] ?? ''); ------------------------------------------------------------------------ [2019-11-05 11:20:40] nikic@php.net I can't reproduce this: https://3v4l.org/9NvcY ------------------------------------------------------------------------ [2019-11-04 12:31:12] bugreport2 at gmail dot com Description: ------------ "Trying to access array offset on value of type null" is new and fully dserved but in context of "Null Coalescing Operator" it makes no sense no matter if $arr or $arr[0] is undefined, the left side is NULL and so assign '' and you are done - probably even potential for optimization $arr = mysqli_fetch_row($result); $oldcontent = $arr[0] ?? ''; AUTOTEST ERROR-HANDLER: 'code: 8' 'msg: Trying to access array offset on value of type null' 'file: misc.php' 'line: 116' ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=78779&edit=1