note 117812 added to function.array-walk

Here is how to perform an operation on some of the elements of an array: <?php $an_array = array( 'item1' => 0, 'item2' => 0, 'item3' => 0, 'item4' => 0, 'item5' => 0, ); $items_to_modify = array('item1', "item3"); array_map(function ($value) use (&$an_array ) { $an_array [$value] = (boolean)$an_array [$value]; //example operation: }, $items_to_modify); ?> This will take the original array and perform an action only on items specified on the second array items. Use of & symbol in the use statement makes the array_map access the variable as a reference in an outer scope. This makes code easily extendable. ---- Server IP: 72.52.91.14 Probable Submitter: 62.254.108.50 ---- Manual Page -- http://php.net/manual/en/function.array-walk.php Edit -- https://master.php.net/note/edit/117812 Del: integrated -- https://master.php.net/note/delete/117812/integrated Del: useless -- https://master.php.net/note/delete/117812/useless Del: bad code -- https://master.php.net/note/delete/117812/bad+code Del: spam -- https://master.php.net/note/delete/117812/spam Del: non-english -- https://master.php.net/note/delete/117812/non-english Del: in docs -- https://master.php.net/note/delete/117812/in+docs Del: other reasons-- https://master.php.net/note/delete/117812 Reject -- https://master.php.net/note/reject/117812 Search -- https://master.php.net/manage/user-notes.php