我不会在laravel中获得数组或对象的值

I already get data like this Using laravel query builder

[0]
    Category_id:1,
    product:food
[1]
    Category_id=1
    product:fish
[2]
   Category_id=1
   product:vegetable

But I want this formate

category_id 1{
          product
                { "Food","Fish","Vegetable"}

}

You can use pluck:

$collection->pluck('product')->all();

The pluck method retrieves all of the values for a given key

Try this:

$collection->groupBy('category_id')
    ->map(function($item) {
        return $item->pluck('product');
    });