Array Difference Helpers on Laravel 9

Question

I want to get the difference between the two arrays in my controller. If I use array_diff() function, it gives me an error array_diff(): Argument #1 ($array) must be of type array, Illuminate\Support\Collection given.

$newListOfArray = array_diff($newArrayTags, $oldArrayTags);

Both arrays are definitely arrays.

My $oldArrayTags array.

#items: array:2 [▼
   0 => "egg"
   1 => "beef"
]

My $newArrayTags array.

#items: array:4 [▼
   0 => "egg"
   1 => "beef"
   2 => "chicken"
   3 => "sausage"
]

When I checked on Laravel 9 Array Helpers Documentation, I couldn't find any array helpers that will provide the difference.

Questions:

1. Why am I getting an error if I use array_diff though it was an array?
2. What is the array helper in Laravel 9 that I can use to get the difference between two arrays?

Answer 1

it looks like a collection, not array you can use collection diff method https://laravel.com/docs/9.x/collections#method-diff

$newArrayTags->diff($oldArrayTags)

or using array_diff if you prefer:

$newListOfArray = array_diff($newArrayTags->toArray(), $oldArrayTags->toArray());