Retrieve a value from a SimpleXML object - php

Question

Excuse me for asking such a "noob" question, but I have been trying to find a simple example of how to loop through my returned xml for the past few hours and I'm getting no where. I just want to be able to cycle through the xml and pull the 'Amount' attribute and 'AmazonOrderId' attribute for each Order. I don't know how to loop, nor how to grab the pertinent data.
SimpleXMLElement Object
(
[ListOrdersResult] => SimpleXMLElement Object
(
[Orders] => SimpleXMLElement Object
(
[Order] => Array
(
[0] => SimpleXMLElement Object
(
[ShipmentServiceLevelCategory] => SecondDay
[OrderTotal] => SimpleXMLElement Object
(
[Amount] => 5.93
[CurrencyCode] => USD
)
[SellerOrderId] => 107-1261608-7067458
[FulfillmentChannel] => AFN
[BuyerEmail] => 5qhs64ktb88pdsj#marketplace.amazon.com
[OrderStatus] => Shipped
[BuyerName] => Derrick D Vann
[ShipServiceLevel] => SecondDay
[LastUpdateDate] => 2013-03-13T02:20:31Z
[PurchaseDate] => 2013-03-11T06:14:40Z
[NumberOfItemsUnshipped] => 0
[MarketplaceId] => ATVPDKIKX0DER
[SalesChannel] => Amazon.com
[ShippingAddress] => SimpleXMLElement Object
(
[Phone] => 202 746-2567
[PostalCode] => 20001-4040
[Name] => Derrick Vann
[CountryCode] => US
[StateOrRegion] => DC
[AddressLine1] => 2120 Vermont Ave NW Apt 117
[City] => Washington
)
[NumberOfItemsShipped] => 1
[AmazonOrderId] => 107-1261608-7067458
[PaymentMethod] => Other
)
[1] => SimpleXMLElement Object
(
[ShipmentServiceLevelCategory] => Expedited
[OrderTotal] => SimpleXMLElement Object
(
[Amount] => 23.30
[CurrencyCode] => USD
)
[SellerOrderId] => 104-9066827-4446667
[FulfillmentChannel] => AFN
[BuyerEmail] => 6kfc88nrsnm83fq#marketplace.amazon.com
[OrderStatus] => Shipped
[BuyerName] => Quoc Bui
[ShipServiceLevel] => Expedited
[LastUpdateDate] => 2013-03-13T09:34:26Z
[PurchaseDate] => 2013-03-11T08:07:13Z
[NumberOfItemsUnshipped] => 0
[MarketplaceId] => ATVPDKIKX0DER
[SalesChannel] => Amazon.com
[ShippingAddress] => SimpleXMLElement Object
(
[Phone] => [phone]
[PostalCode] => 2204
[Name] => Quoc Minh Bui
[CountryCode] => AU
[StateOrRegion] => New South Wales
[AddressLine1] => 19 Centennial St
[City] => Marrickville
)
[NumberOfItemsShipped] => 1
[AmazonOrderId] => 104-9066827-4446667
[PaymentMethod] => Other
)
...

Answer 1

SimpleXML is just great, isn't it?
foreach ($xml->ListOrdersResult->Orders->Order as $order) {
$amazonOrderId = (string) $order->AmazonOrderId;
$orderTotal = (string) $order->OrderTotal->Amount;
}
I use (string) type casting because you'd get SimpleXMLElements back for those scalar values otherwise.

Answer 2

pull the 'Amount' attribute and 'AmazonOrderId' attribute for each Order.
If I take you word-by-word, then this is what you're looking for:
$allThoseAttributes = $xml->xpath('//Order/#Amount|//Order/#AmazonOrderId');
However, more likely you're looking for:
$orders = [];
foreach ($xml->xpath('//Order') as $order) {
$orders[] = [
'amazon' => (string) $order->AmazonOrderId
'total' => (string) $order->OrderTotal->Amount;
];
}
because what you call attributes are infact elements. If you want to learn more about XML and Xpath, this is a good read: XPath