Laravel slice in collection

Question

I've got this code in my Laravel 5.6 controller:

$ads = Advertisement::actives();

$ports = Port::filter($filters)
    ->actives()
    ->paginate(28);

I would like to add every 4th port one advertisement. How could I do this?

So result should be:

//Collection
[
   //Port,
   //Port,
   //Port,
   //Port
   //Advertisement
   //Port
   //Port
   //Port
   //Port
   //Advertisement

   //etc...
]

Answer 1

If each of your add contains the same code, you can do it like this:

$ports = collect([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]);

$ads = 'ad';

$ports = $ports->chunk(4)->each->push($ads)->collapse();

This will give you:

Collection {#530 ▼
  #items: array:14 [▼
    0 => 1
    1 => 2
    2 => 3
    3 => 4
    4 => "ad"
    5 => 5
    6 => 6
    7 => 7
    8 => 8
    9 => "ad"
    10 => 9
    11 => 10
    12 => 11
    13 => "ad"
  ]
}

But if in $ads you have multiple ads, you need to use a bit longer notation:

$ports = collect([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]);

$ads = ['ad1', 'ad2', 'ad3'];

$ports = $ports->chunk(4)->map(function($items, $key) use ($ads) {
    return $items->push($ads[$key]);
})->collapse();

dd($ports);

This will give you:

Collection {#530 ▼
  #items: array:14 [▼
    0 => 1
    1 => 2
    2 => 3
    3 => 4
    4 => "ad1"
    5 => 5
    6 => 6
    7 => 7
    8 => 8
    9 => "ad2"
    10 => 9
    11 => 10
    12 => 11
    13 => "ad3"
  ]
}

For reference you can take a look at Collections documentation