Looping an array within an array php - php

Question

Hi there i need some help to loop an array of items.
The part that I have repeated needs to be looped in order to get multiple items from the database. At this stage I am only to invoice one item where as users generally purchase a few so i need to run a foreach statement I think. Please excuse my ignorance and lack of understanding, I have tried a series of things but they do not seem to work
$json1 = array(
'Date' => $currentDate->format('Y-m-d\TH:i:s'),
'Customer' => array(
'DisplayID' => $phone
),
'CustomerPurchaseOrderNumber' => $ordID,
'Freight' => '0',
'BalanceDueAmount' => '0.0',
'Status' => 'Closed',
'Lines' => /*$orderDetails,*/ array(
array(
'ShipQuantity' => $ShowDetails['quantity'],
'UnitPrice' => $ShowDetails['unit_price'],
'Total' => $ShowDetails['total_price'],
'Item' => array(
'UID' => $productUID,//itemuid(609400gmkit)
),
'Description' => $productTitle. ' ' .$sizeTitle. ' '
.$colorTitle,
'TaxCode' => array(
'UID' => '7d1f2e99-ffe0-4463-9c29-
61d078b392d3'//taxcodeuid(GST)
)
)
),
'Freight' => $shippingprice,//if dg then $10 otherwise $0 unless below
$100
'ShippingMethod' => $ShippingMethod,// if dg the 'MyFreight' otherwise
'transdirect'
);
The portion that i need to loop is as follows :
array(
'ShipQuantity' => $ShowDetails['quantity'],
'UnitPrice' => $ShowDetails['unit_price'],
'Total' => $ShowDetails['total_price'],
'Item' => array(
'UID' => '27d56af8-d3d6-4f0a-b71b-
4586fffbd63a'//itemuid(609400gmkit)
),
'Description' => $productTitle. ' ' .$sizeTitle. ' '
.$colorTitle,
'TaxCode' => array(
'UID' => '7d1f2e99-ffe0-4463-9c29-
61d078b392d3'//taxcodeuid(GST)
)
)*/