note 119633 added to migration70.incompatible

It is stated: "foreach by-value operates on a copy of the array When used in the default by-value mode, foreach will now operate on a copy of the array being iterated rather than the array itself. This means that changes to the array made during iteration will not affect the values that are iterated." Please note that this is not exactly true. New foreach operates on a copy of the array, by-value or by-reference. It seems that in the latter case, the array copy is simply moved over (to) the original array before it is presumably destroyed. As a consequence of this, you may not "dereference" an array containing values - e.g. for use with ReflectionMethod::invokeArgs() or the good ole' call_user_func(). Consider the snippet below: <?php function deref(Array $inputArray) { $retVal = []; foreach ($inputArray as &$inputValue) { $retVal[] = $inputValue; } return $retVal; } ?> As of PHP 7.0, this *will no longer work*. You will get the usual suspect: PHP Warning: Parameter n to whatever() expected to be a reference, value given in baz.php on line x You need to convert it to explicitly reference the original array: <?php function deref(Array $inputArray) { $retVal = []; foreach ($inputArray as $inputKey => $inputValue) { $retVal[$inputKey] = &$inputArray[$inputKey]; } return $retVal; } ?> PLEASE NOTE that this might have the unforeseen consequence of your code not working anymore in php versions less than 5.3 (that is, 5.2 and below). ---- Server IP: 72.52.91.14 Probable Submitter: 109.61.74.220 ---- Manual Page -- http://php.net/manual/en/migration70.incompatible.php Edit -- https://master.php.net/note/edit/119633 Del: integrated -- https://master.php.net/note/delete/119633/integrated Del: useless -- https://master.php.net/note/delete/119633/useless Del: bad code -- https://master.php.net/note/delete/119633/bad+code Del: spam -- https://master.php.net/note/delete/119633/spam Del: non-english -- https://master.php.net/note/delete/119633/non-english Del: in docs -- https://master.php.net/note/delete/119633/in+docs Del: other reasons-- https://master.php.net/note/delete/119633 Reject -- https://master.php.net/note/reject/119633 Search -- https://master.php.net/manage/user-notes.php