note 75629 added to language.references.whatdo

Something that might not be obvious on the first look: If you want to cycle through an array with references, you must not use a simple value assigning foreach control structure. You have to use an extended key-value assigning foreach or a for control structure. A simple value assigning foreach control structure produces a copy of an object or value. The following code $v1=0; $arrV=array(&$v1,&$v1); foreach ($arrV as $v) { $v1++; echo $v."\n"; } yields 0 1 which means $v in foreach is not a reference to $v1 but a copy of the object the actual element in the array was referencing to. The codes $v1=0; $arrV=array(&$v1,&$v1); foreach ($arrV as $k=>$v) { $v1++; echo $arrV[$k]."\n"; } and $v1=0; $arrV=array(&$v1,&$v1); $c=count($arrV); for ($i=0; $i<$c;$i++) { $v1++; echo $arrV[$i]."\n"; } both yield 1 2 and therefor cycle through the original objects (both $v1), which is, in terms of our aim, what we have been looking for. (tested with php 4.1.3) ---- Server IP: 212.124.37.9 Probable Submitter: 194.37.75.240 ---- Manual Page -- http://www.php.net/manual/en/language.references.whatdo.php Edit -- https://master.php.net/note/edit/75629 Del: integrated -- https://master.php.net/note/delete/75629/integrated Del: useless -- https://master.php.net/note/delete/75629/useless Del: bad code -- https://master.php.net/note/delete/75629/bad+code Del: spam -- https://master.php.net/note/delete/75629/spam Del: non-english -- https://master.php.net/note/delete/75629/non-english Del: in docs -- https://master.php.net/note/delete/75629/in+docs Del: other reasons-- https://master.php.net/note/delete/75629 Reject -- https://master.php.net/note/reject/75629 Search -- https://master.php.net/manage/user-notes.php