transformCollection.txt

Given this collection:

Illuminate\Support\Collection {#1108
 all: [
   "verb" => [
     "have",
     "have-not",
   ],
   "type" => [
     "1",
     "2",
   ],
   "days" => [
     "30",
     "10",
   ],
 ],
}

How can I change it to:

Illuminate\Support\Collection {#1121
 all: [
   [
     "verb" => [
       "have",
     ],
     "type" => [
       "1",
     ],
     "days" => [
       "30",
     ],
   ],
   [
     "verb" => [
       "have-not",
     ],
     "type" => [
       "2",
     ],
     "days" => [
       "10",
     ],
   ],
 ],
}

The transpose operation can help here, although it's not built-in to Laravel due to a bunch of bike-shedding over edge case behavior :)

Here's a quick implementation:

Collection::macro('transpose', function () {
    $items = array_map(function (...$items) {
        return $items;
    }, ...$this->values());

    return new static($items);
});

...and here's a blog post that explains what it does:

https://adamwathan.me/2016/04/06/cleaning-up-form-input-with-transpose/

Using that + an extra map operation, you can get your desired output like so:

$input = collect([
    "verb" => [
        "have",
        "have-not",
    ],
    "type" => [
        "1",
        "2",
    ],
    "days" => [
        "30",
        "10",
    ]
]);

return $input->transpose()->map(function ($items) use ($input) {
    return $input->keys()->combine($items);
});