Diff values between arrays

Question

I have these two arrays as a result of requests:

$f = DocsPf::where('renda', '=', 2)->where('tipo', '=', 'R')->pluck('id');
$f = [4,5,6,7,8,9,10]

And

$d = Documento::where('user_id', '=', $id)->pluck('cad_doc_id');
[4,5,6,7,8]

Now I want to make a request to a model only with the difference between those arrays, like:

$missing = Docs::where('id', '=', 9)->first();

and

$missing = Docs::where('id', '=', 10)->first();

I´ve did

$ids = array_diff($f, $d);
        return $ids;

...as the brother bellow wrote, but got hits error:

array_diff(): Expected parameter 1 to be an array, object given

Any helps, please?

Relevant earlier question: Laravel Chat -- prevent creating new room if two users already have one — mickmackusa
– mickmackusa ♦, Commented Mar 14, 2024 at 1:08

Tim Lewis · Accepted Answer · 2019-10-07 19:30:03Z

2

You can use array_diff() on the two arrays to get unique values:

$array1 = [4,5,6,7,8,9,10];
$array2 = [4,5,6,7,8];

$uniqueIds = array_diff($array1, $array2); // `[9, 10]`

$missing = Docs::whereIn("id", $uniqueIds)->get();
// Will return a `Collection` of `Doc` models based on the passed `ids`

-- Edit --

If $array1 and $array2 are Collections, you can use the diff() function:

$array1 = collect([4,5,6,7,8,9,10]);
$array2 = collect([4,5,6,7,8]);

$uniqueIds = $array1->diff($array2);
$missing = Docs::whereIn("id", $uniqueIds)->get();
// Note: You may need to do `$uniqueIds->toArray()` if it complains further.

One more alternative, you can convert $array1 and $array2 to arrays before using array_diff()

$uniqueIds = array_diff($array1->toArray(), $array2->toArray());

It's a little redundant, but should help demonstrate the difference between an array and a Collection

edited Oct 7, 2019 at 19:30

answered Oct 7, 2019 at 19:20

Tim Lewis

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2 Comments

Marcello Pato Over a year ago

Thanks, @Vince, but I´ve forgot to say that the array is a result of a request... so, maybe it is not an array, but an object.

Tim Lewis Over a year ago

It's a Collection, which is a fancy helper class for arrays in Laravel. They can easily be converted to an array, via ->toArray(), or you can use ->diff() as demonstrated.

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