Bug #71926 [Opn->Dup]: "undefined offset" raised for existing offset

Edit report at https://bugs.php.net/bug.php?id=71926&edit=1 ID: 71926 Updated by: nikic@php.net Reported by: rvanvelzen at experty dot com Summary: "undefined offset" raised for existing offset -Status: Open +Status: Duplicate Type: Bug Package: Scripting Engine problem Operating System: Debian 8.3 PHP Version: 7.0.4 Block user comment: N Private report: N New Comment: Duplicate of bug #71334. Previous Comments: ------------------------------------------------------------------------ [2016-03-30 20:22:43] rvanvelzen at experty dot com Description: ------------ We're currently upgrading to PHP7, and noticed a notice which wasn't present in PHP5. In PHP5 there is a warning regarding modification of the array, due to the reference to $sortingData. In PHP7 however, an offset is missing. Strangely, when var_dump'ing the indexes of the array, the 0 index is present. Test script: --------------- <?php ini_set('display_errors', true); error_reporting(E_ALL); $sortingData = [ 0 => 10, 1 => 12, // This key is magic - anything >= 8 (or a non-integer key) makes this script produce the E_NOTICE 8 => 11, ]; uksort($sortingData, function ($a, $b) use (&$sortingData) { return $sortingData[$a] > $sortingData[$b] ? -1 : 1; }); var_dump($sortingData); Expected result: ---------------- Warning: uksort(): Array was modified by the user comparison function in /home/richard/break.php on line 15 array(3) { [1]=> int(12) [8]=> int(11) [0]=> int(10) } Actual result: -------------- Notice: Undefined offset: 0 in /home/richard/break.php on line 14 array(3) { [1]=> int(12) [8]=> int(11) [0]=> int(10) } ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=71926&edit=1