发送具有相同名称的多个输入值后，未创建数组

Question

I am trying to send a few input fields to my PHP file and loop them there so I need them as an array.

These are my input fields:

<input type="hidden" name="productencheckout[3314,99|1 pallet][kuub]" value="1 pallet">
<input type="hidden" name="productencheckout[3314,99|1 pallet][price]" value="31499">
<input type="hidden" name="productencheckout[3314,99|1 pallet][quantity]" value="1">
<input type="hidden" name="productencheckout[2][price]" value="27999">
<input type="hidden" name="productencheckout[2][quantity]" value="1">
<input type="hidden" name="productencheckout[70][price]" value="30999">
<input type="hidden" name="productencheckout[70][quantity]" value="1">
<input type="hidden" name="productencheckout[3624,99|2 pallets][kuub]" value="2 pallets">
<input type="hidden" name="productencheckout[3624,99|2 pallets][price]" value="62499">
<input type="hidden" name="productencheckout[3624,99|2 pallets][quantity]" value="1">

And it is posted like this:

productencheckout[3314,99|1 pallet][kuub]: 1 pallet
productencheckout[3314,99|1 pallet][price]: 31499
productencheckout[3314,99|1 pallet][quantity]: 1
productencheckout[2][price]: 27999
productencheckout[2][quantity]: 1
productencheckout[70][price]: 30999
productencheckout[70][quantity]: 1
productencheckout[3624,99|2 pallets][kuub]: 2 pallets
productencheckout[3624,99|2 pallets][price]: 62499
productencheckout[3624,99|2 pallets][quantity]: 1

So I tried the following:

echo $_POST['productencheckout']['3314,99|1 pallet']['kuub'];

$productarr = $_POST['productencheckout'];

echo '<pre>';
print_r($productarr);
echo '</pre>';

But it is all empty. Why?