PHP / Laravel: How to save a multidimensional array into the DB - php

Question

I have a large form where 3 arrays are sent to the controller from the form: product_code | quantity | cost.
$id = $request->get('product_code'); // GRAB PRODUCT DATA FROM POST ARRAY
$qty = $request->get('quantity'); // GRAB QUANTITY DATA FROM POST ARRAY
$cost = $request->get('cost'); // GRAB COST DATA FROM POST
The output from the request on all three arrays is here: PasteBin
My problem is I can not figure out how best to loop through each of these three arrays so that I can insert into MySQL the values in the correct order. I have tried both a foreach, a nested foreach and a for loop and I have not managed yet to get all three values inserting onto a single row.
I don't think the HTML is very relevant, but here is a sample anyway:
<div class="well form-group ">
<div class="col-sm-2 col-md-2">
<label for="nails_staples">Nails & Staples:</label>
</div>
<div class="col-sm-4 col-md-4">
<select class="form-control product_id" name="product_code[10]">
<option selected="selected" value="">None</option>
<option value="8769">1 1/4 Coil Nails - box | $26.00</option>
<option value="6678">2" Hot Dipped Shake Nails | $135.00</option>
</select>
</div>
<div class="col-sm-1 col-md-1">
<label for="nails_req">Quantity:</label>
</div>
<div class="col-sm-2 col-md-2">
<input class="form-control quantity" name="quantity[10]" type="text">
</div>
<div class="col-sm-1 col-md-1">
<label for="cost">Cost:</label>
</div>
<div class="col-sm-2 col-md-2">
<input class="form-control cost" readonly="readonly" name="cost[]" type="text">
</div>
</div>

Answer 1

There are a few issues with this approach. Ideally you'd have separate calls to a controller for each entity you want to change, using AJAX to make each individual call as the user changes the entity. This solves the issue of attributes not being strongly tied to the entity ID (in your case, product_code).
If you're willing to make the assumption that all of the arrays match up, you should at least check that they are the same length.
Obviously I don't know all the specifics of your Model or exactly what you're looking for, but based on your paste bin, this should work.
$id = $request->get('product_code'); // GRAB PRODUCT DATA FROM POST ARRAY
$qty = $request->get('quantity'); // GRAB QUANTITY DATA FROM POST ARRAY
$cost = $request->get('cost'); // GRAB COST DATA FROM POST
$count_ids = count($id);
if(count($qty) != $count_ids || count($cost) != $count_ids) throw new Exception("Bad Request Input Array lengths");
for($i = 0; $i < $count_ids; $i++){
if (empty($id[$i])) continue; // skip all the blank ones
$newProduct = new Product();
$newProduct->code = $id[$i];
$newProduct->qty = $qty[$i];
$newProduct->cost = $cost[$i];
$newProduct->save();
}