note 117780 added to language.references.arent

Consider this block of code: <?php $arr = ['1', '2', '3', '4']; foreach ($arr as &$i) {} echo implode($arr, ', ')."\n"; foreach ($arr as $i) {} echo implode($arr, ', ')."\n"; ?> which will output 1, 2, 3, 4 1, 2, 3, 3 although it seems no changes were made to the array. The last item in the array gets overwritten, because reference is replaced by a copy in the second iteration. In more detail, it gets overwritten first by a 1, then by 2, by 3 and again by a 3. Make sure to do an unset($i) when you run an iteration by copy after an iteration by reference using same variable names! ---- Server IP: 72.52.91.14 Probable Submitter: 93.77.231.181 ---- Manual Page -- http://php.net/manual/en/language.references.arent.php Edit -- https://master.php.net/note/edit/117780 Del: integrated -- https://master.php.net/note/delete/117780/integrated Del: useless -- https://master.php.net/note/delete/117780/useless Del: bad code -- https://master.php.net/note/delete/117780/bad+code Del: spam -- https://master.php.net/note/delete/117780/spam Del: non-english -- https://master.php.net/note/delete/117780/non-english Del: in docs -- https://master.php.net/note/delete/117780/in+docs Del: other reasons-- https://master.php.net/note/delete/117780 Reject -- https://master.php.net/note/reject/117780 Search -- https://master.php.net/manage/user-notes.php