Convert Collection to Array with I=ID in Laravel - php

Question

I am beginner php developer.
I have small problem with my array. I use in my project Laravel 7
I have this code:
$items = collect($discount->products->toArray());
It's result me:
Illuminate\Support\Collection {#1783 ▼
#items: array:2 [▼
0 => array:17 [▼
"id" => 1
"product_category_id" => 5
"image_id" => null
"vat_type_id" => 1
"name" => "Produkt 1"
"slug" => "produkt-1"
"lead" => "<p>fewferfer</p>"
"description" => "<p> </p>"
"price" => "123.00"
"loyalty_program_points_price" => 2
"min_student_level" => null
"marked_as_available_at" => "2020-09-30T11:45:51.000000Z"
"deactivated_at" => null
"created_at" => "2020-09-30T11:45:23.000000Z"
"updated_at" => "2020-09-30T11:45:51.000000Z"
"deleted_at" => null
"pivot" => array:3 [▶]
]
1 => array:17 [▼
"id" => 2
"product_category_id" => 5
"image_id" => null
"vat_type_id" => 1
"name" => "Produkt 2"
"slug" => "produkt-2"
"lead" => "<p> </p>"
"description" => "<p>fergfer</p>"
"price" => "21.00"
"loyalty_program_points_price" => 3
"min_student_level" => null
"marked_as_available_at" => "2020-09-30T11:45:38.000000Z"
"deactivated_at" => null
"created_at" => "2020-09-30T11:45:38.000000Z"
"updated_at" => "2020-09-30T11:45:38.000000Z"
"deleted_at" => null
"pivot" => array:3 [▶]
]
]
}
I need convert it to this result:
Array{
1 => 1 (id)
2 => (id)
}
How can I make it?
I need array with only id values

Answer 1

Collections have the pluck method, which allows you to grab all the values of a specific key. To get all of the ids, you'd just need to do
$ids = $items->pluck('id')->all();
If you want them to have the same key as the id as well, pass that as the second parameter
$ids = $items->pluck('id', 'id')->all();
As a note, if products is a relation, then it's already a collection. You do not need to convert it to an array, then back to a collection:
$product_ids = $discount->products->pluck('id')->all();