How to store values from foreach loop into an array?

Question

Need to store values from foreach loop into an array, need help doing that.

The code below does not work, only stores the last value, tried $items .= ...,

Answer 1

Just to save you too much typos:

foreach($group_membership as $username){
        $username->items = array(additional array to add);
    }
    print_r($group_membership);