SimpleXMLElement到PHP变量

Question

我一直在尝试从返回的此XML的Amount区域获取LandedPrice。我试过这个和其他类似的代码。有人会对我如何从中获取这些信息提出任何建议吗？

$simplexml = new SimpleXMLElement($response); // Is response from server.
$amount = (string) $simplexml->CompetitivePrice[0]->LandedPrice->Price->Amount;


SimpleXMLElement Object 
( [GetCompetitivePricingForASINResult] => SimpleXMLElement Object 
    ( [@attributes] => Array ( [ASIN] => B00H9M9B34 [status] => Success ) [Product] => SimpleXMLElement Object 
        ( [Identifiers] => SimpleXMLElement Object 
            ( [MarketplaceASIN] => SimpleXMLElement Object 
                ( [MarketplaceId] => ATVPDKIKX0DER [ASIN] => B00H9M9B34 ) 
            ) [CompetitivePricing] => SimpleXMLElement Object 
            ( [CompetitivePrices] => SimpleXMLElement Object 
            ( [CompetitivePrice] => SimpleXMLElement Object 
                ( [@attributes] => Array ( [belongsToRequester] => false [condition] => New [subcondition] => New ) [CompetitivePriceId] => 1 [Price] => SimpleXMLElement Object 
                ( [LandedPrice] => SimpleXMLElement Object 
                    ( [CurrencyCode] => USD [Amount] => 75.00 ) [ListingPrice] => SimpleXMLElement Object 
                    ( [CurrencyCode] => USD [Amount] => 75.00 ) [Shipping] => SimpleXMLElement Object 
                    ( [CurrencyCode] => USD [Amount] => 0.00 ) 
                ) 
                ) 
            ) [NumberOfOfferListings] => SimpleXMLElement Object 
                ( [OfferListingCount] => Array ( [0] => 1 [1] => 1 ) ) 
            ) [SalesRankings] => SimpleXMLElement Object 
            ( [SalesRank] => SimpleXMLElement Object 
                ( [ProductCategoryId] => sports_display_on_website [Rank] => 625877 ) 
            ) 
        ) 
    )
    [ResponseMetadata] => SimpleXMLElement Object 
    ( [RequestId] => 234234343d-bawff3f3-vef5555rrer) 
)