Bug #70319 [Dup->Csd]: Foreach weird behaviour with references

Edit report at https://bugs.php.net/bug.php?id=70319&edit=1 ID: 70319 User updated by: bensor987 at neuf dot fr Reported by: bensor987 at neuf dot fr Summary: Foreach weird behaviour with references -Status: Duplicate +Status: Closed Type: Bug Package: Scripting Engine problem Operating System: Irrelevant PHP Version: Irrelevant Block user comment: N Private report: N New Comment: Nvm, got an explanation. Previous Comments: ------------------------------------------------------------------------ [2015-08-21 13:23:59] nikic@php.net Duplicate of https://bugs.php.net/bug.php?id=29992. ------------------------------------------------------------------------ [2015-08-21 13:17:10] bensor987 at neuf dot fr Description: ------------ I've seen this on a reddit post, I thought it would be nice to put it here. There's a weird behaviour, when looping two times in an arrow, using referenced values : the first loop will change the value of the last element, with the same value as the previous one. See the example. I've tested this with strings and arrays. This behaviour is present since forever (including 7.0 RC1). Test script: --------------- <?php // Strings $data = array('a','b','c','d'); foreach ($data as $k => &$value) {} foreach ($data as $value) { echo $value; } // Arrays $data = array(array(1,2),array(3,4),array(5,6),array(7,8)); foreach ($data as $k => &$value) {} foreach ($data as $value) { var_dump($value); } Expected result: ---------------- abcd array(2){[0]=> int(1)[1]=> int(2)} array(2){[0]=> int(3)[1]=> int(4)} array(2){[0]=> int(5)[1]=> int(6)} array(2){[0]=> int(7)[1]=> int(8)} Actual result: -------------- abcc array(2){[0]=> int(1)[1]=> int(2)} array(2){[0]=> int(3)[1]=> int(4)} array(2){[0]=> int(5)[1]=> int(6)} array(2){[0]=> int(5)[1]=> int(6)} ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=70319&edit=1