Laravel Collections :multidimensional array, Group by keys and unique values - php

Question

How would one do the following with laravel collections
We got this array : Let's assume we don't know the multi keys in advance
$input =[
['name' =>'John McClane','age'=>'40' ],
['name' =>'John McClane','age'=>'50' ],
['name' =>'Hans Gruber','age'=>'40' ],
['name' =>'Hans Gruber','age'=>'50' ],
['name' =>'Holly McClane','age'=>'20' ],
['name' =>'Holly McClane','age'=>'49' ],
];
$output =[
'name' => [
'John McClane',
'Hans Gruber',
'Holly McClane'
],
'age' =>[
'40',
'50',
'20',
'49'
]
];
Update : #Felippe Duarte added the PHP plain version on how one would do it.
$output =[];
foreach($input as $arr){
$keys = array_keys($arr);
foreach ($keys as $key) {
$output[$key] = array_unique(array_column($input, $key));
}
}
Just replacing array_unique(array_column($input, $key));
with $input->pluck($key)->toArray(); is not very interesting.
What I am wondering , is there a neat way to this entirely with a laravel collection in a single line?
Group by multidimensional keys, with unique values.
Cheers!

Answer 1

With plain PHP you can use array_column and array_unique:
$output = [
'name' => array_unique(array_column($input, 'name')),
'age' => array_unique(array_column($input, 'age')),
];
With collection you can use pluck and unique:
$output = [
'name' => $input->pluck('name')->unique(),
'age' => $input->pluck('age')->unique(),
];
If you don't know the keys, use array_keys or keys(), get the keys then repeat the above process:
$keys = array_keys($input); //$input->keys();
foreach ($keys as $key) {
$output[$key] = $input->pluck($key)->unique();
}