Online PHP editor | output for EgU1G

<?php $myarray = array( 0 => array( "Order" => array("PO" => "TR11214", "OrderID" => 242856952012), "Sales Tax" => array("PO" => "TR11214", "SalesTaxAmount" => 0.00), "Transaction" => array("TransPO" => "TR11211", "TransactionPrice" => 91.17) ), 1 => array( "Order" => array("PO" => "TR11214", "OrderID" => 242856952012), "Sales Tax" => array("PO" => "TR11214", "SalesTaxAmount" => 0.00), "Transaction" => array("TransPO" => "TR11212", "TransactionPrice" => 180.41) ), 2 => array( "Order" => array("PO" => "TR11214", "OrderID" => 242856952012), "Sales Tax" => array("PO" => "TR11214", "SalesTaxAmount" => 0.00), "Transaction" => array("TransPO" => "TR11213", "TransactionPrice" => 209.99) ) ); echo "there are " . count(array_unique(array_column($myarray, 'Order'), SORT_REGULAR)) . "unique Orders\n"; $non_unique_keys = ['Transaction']; $output = array(); foreach (array_keys($myarray[0]) as $key) { if (in_array($key, $non_unique_keys)) { $output[$key] = array_column($myarray, $key); } else { $output[$key] = $myarray[0][$key]; } } print_r($output);