Laravel 5.4: how to iterate through request array?

My request data represents an array of new and existing items. I'm trying to through this array to update and create items.

This is how I retrieve the array:

$userInput = $request->all();
foreach( $userInput['items'] as $key=>&$item){

Later in the code I update an existing item:

$updateItem = Item::find($item['id']);
$updateItem->number = $item['number'];
$updateItem->save();

But $item['number'] seems to contain old input from previous updates and not the value I entered last time.

How can I loop through request data in Laravel ?

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