note 117812 deleted from function.array-walk by cmb

Note Submitter: nelf86 at gmail dot com ---- 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.