## whereNotNull 方法筛选给定键不为 NULL 的项： whereNotNull 方法筛选给定键不为 NULL 的项： ``` $collection = collect([ ['name' => 'Desk'], ['name' => null], ['name' => 'Bookcase'], ]); $filtered = $collection->whereNotNull('name'); $filtered->all(); /* [ ['name' => 'Desk'], ['name' => 'Bookcase'], ] */ ```