Laravel - Carry array through map

Question

Let's say I have a model collection that I'm mapping through like this:

$alreadyImported = [];

$players = Players::whereNotIn('id', $alreadyImported)
                    ->get()
                    ->random(25)
                    ->pluck('id');

$groups = $players->map(function ($item, $key) use ($alreadyImported) {

    array_merge($alreadyImported, $item->id);

    $group = [
        'username' => $item['username'],
    ];

    return $group;
});

// $groups is a pivot table with group and players

Why does my $globalList always start at []? How can I carry the already-merged $globalList to the next map iteration?

The player IDs does not matter. It's for show. I am looking to pass the array through the map iterations.

Something like this? php.net/manual/en/language.references.pass.php — greener
– greener, Commented Feb 21, 2018 at 16:23

Alexey Mezenin · Accepted Answer · 2018-02-21 16:26:19Z

2

Just use pluck() to get IDs from the collection:

$ids = $players->pluck('id');

Or, if you just need IDs:

$ids = Players::where('banned', false)->pluck('id');

If you're going to add any other data, you don't need to merge it to some array or a collection because map() will create a new collection.

Finally, you don't need to use collect() because get() will return collection.

answered Feb 21, 2018 at 16:26

Alexey Mezenin

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4 Comments

test Over a year ago

I am not looking for player IDs. I am looking to pass an array through a map iteration. The Ids was just an example.

Alexey Mezenin Over a year ago

@nn2 well, you haven't explained what exactly do you want to achieve. And as I said in the answer, you don't need to pass an array.

test Over a year ago

I clearly state it in the post. Every time a map iteration starts, $globalList = [] is reinitialized as []. How do I carry the merged-array over to the next iteration?

Alexey Mezenin Over a year ago

@nn2 if you want to reinvent the wheel, follow the link greener gave you in the comment.

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