php - Why's the value returning null when the variable's being correctly changed according to the dd()?

I currently have 2 functions I'm working with. Originally, thefetchInventories() function didn't require an argument because I'm fetching some query results I need to use which's happening inside the{-code-2} function. But down the line, I needed to make sure the query knows what's the current page number so I have to pass$current_page to thefetchInventories() function.

My question is: How would I be able to send the$current_page variable with the correct value? When Idd($current_page); inside the{-code-2} function, it correctly displays2. But when I do the same thing inside thefetchInventories() function, it returns null. I thought thatnull value got replaced with the aforementioned correct value?

What am I doing wrong & how can I rectify this?

Here's thefetchInventories function

private function fetchInventories($current_page) {
    $information = $this->getInventoryWithInformation();

    dd($current_page); // returning null here

    return $this->model
                ->join('item', 'inventoryitem.InventoryItemID', '=', 'item.type')
                ->groupBy('inventoryitem.InventoryItemID')
                ->select("inventoryitem.InventoryItemID", "inventoryitem.Description")
                ->select($information['inventory'])
                ->paginate(28, ['*'], 'page', $current_page);
}
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Here's thegetInventories function

public function {-code-2} {
    $current_page = null;
    $inventories = $this->fetchInventories($current_page);
    $inventoriesArray = $inventories->toArray();
    $current_page = $inventoriesArray['current_page'];

 // dd($current_page); // correctly displays 2

    $this->fetchInventories($current_page);
                      
    return $inventoriesArray;
}
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