Laravel set null on empty array

i have something data like this json data

my problem is, how to set children to null if there is no data children.

Menu Parent model

Menu children Model

Controller

>Solution :

Try this

$data[] = [
    'id' => $men->id,
    'title' => $men->title,
    'icon' => $men->icon,
    'children' => (count($men->menuchild) > 0) ? $men->menuchild: null,
    ];