Keeping array reference and adding something into that - php

Question

In my very simple Laravel livewire component i have an array and when i try to add another data into that by clicking on a simple for example div i get fresh array with the last inserted data into that and i cant keep this array reference to append something data into that
<div wire:click="addNewSize"></div>
class SellerStoreNewProductComponent extends Component
{
public array $productSizes=[];
//...
public function addNewSize()
{
/* SOLUTION ONE */
//$this->productSizes[] = $this->productSizes + [str::random(10) => str::random(10)];
/* SOLUTION TWO */
//$this->productSizes[][]=array_push($this->productSizes, [str::random(10) => str::random(10)]);
/* SOLUTION THREE */
//array_push($this->productSizes, [str::random(10) => str::random(10)]);
dd($this->productSizes);
}
}
thanks in advance

Answer 1

If you're looking to add a key value pair to an existing array, you most likely want to use array_merge rather than array_push.
array_merge combines two arrays into a single array whereas array_push adds elements to an existing array.
public function addNewSize()
{
$this->productSizes = array_merge(
$this->productSizes, [Str::random(10) => Str::random(10)]
);
}

Answer 2

your current approaches will add a new index with new array data (previous value plus new value). so you just have to add new index to the array.
$this->productSizes['myKey'] = "myValue";