## whereInstanceOf 方法根据给定的类来过滤集合： whereInstanceOf 方法根据给定的类来过滤集合： ``` use App\Models\User; use App\Models\Post; $collection = collect([ new User, new User, new Post, ]); $filtered = $collection->whereInstanceOf(User::class); $filtered->all(); // [App\Models\User, App\Models\User] ```