Laravel /PHP Getting the keys from an array - php

Question

I have a collection
Collection {#364 ▼
#items: array:2 [▼
24 => Collection {#375 ▼
#items: array:3 [▶]
}
0 => Collection {#376 ▶}
]
}
I try and convert to an array grab the keys and sort them
dd(sort(array_keys($group_ids->toarray())));
I get the error Only variables should be passed by reference
I need to convert this collection to an array of the keys in ascending order.
dd(array_keys($group_ids->toArray()));
seems to give what I need but I cannot convert it.
array:2 [▼
0 => 24
1 => 0
]

Answer 1

The Only variables should be passed by reference error is thrown because of the PHP's sort() function requires a reference and it can only be a variable not a return value from another function. To solve this error you can just use an intermediate variable like this:
$keys = array_keys($group_ids->toArray());
sort($keys);
Since you already using Laravel Collection, you can just use the keys() and the sort() methods instead. Suppose the $group_ids is an instance of Collection, you can extract the key and sort it ascendingly like this:
$sortedKeys = $group_ids->keys()->sort()->toArray();
Hope this help!

Answer 2

Below Solution is may be work for you.
When you call User::all() you get something like this:
0 => points: 10
1 => points: 50
2 => points: 30
3 => points: 70
4 => points: 20
What you can do is using the values() function, which will reset the keys of you collection:
0 => points: 70
1 => points: 50
2 => points: 30
3 => points: 20
4 => points: 10
May be you have try to sort data from the value. so key is automatically sorting out.
$users = User::all();
$users = $users->sortByDesc(function($item){
return $item->points()->sum('amount');
})->values();
I am not sure about this solution but hope it helps little bit with your question. in your question i didn't see any query so i have no much how you generate that collections.
Thanks