Search nested object for property

Question

I have an object being returned from an API and i need to see if a property exists. Problem is the properties could be other objects, each of which would need to be searched.

This is probably solved with recursion but i cant get my head around it or my code examples to work.

I'm amazed that i cant find a solution to this online so posting here for expert advice.

This is an example of an object, i need to make sure that "LowestNewPrice" exists and have the value returned

stdClass Object
(
    [OperationRequest] => stdClass Object
        (
            [HTTPHeaders] => stdClass Object
                (
                    [Header] => stdClass Object
                        (
                            [Name] => UserAgent
                            [Value] => PHP-SOAP/5.6.2
                        )

                )

            [RequestId] => 20bd3916-3d92-4519-b3be-c80c7cf16b1b
            [Arguments] => stdClass Object
                (
                    [Argument] => stdClass Object
                        (
                            [Name] => Service
                            [Value] => AWSECommerceService
                        )

                )

            [RequestProcessingTime] => 0.005986476
        )

    [Items] => stdClass Object
        (
            [Request] => stdClass Object
                (
                    [IsValid] => True
                    [ItemLookupRequest] => stdClass Object
                        (
                            [IdType] => ASIN
                            [ItemId] => 1405278269
                            [ResponseGroup] => OfferSummary
                            [VariationPage] => All
                        )

                )

            [Item] => stdClass Object
                (
                    [ASIN] => 1405278269
                    [OfferSummary] => stdClass Object
                        (
                            [LowestNewPrice] => stdClass Object
                                (
                                    [Amount] => 44
                                    [CurrencyCode] => GBP
                                    [FormattedPrice] => £0.44
                                )

                            [LowestUsedPrice] => stdClass Object
                                (
                                    [Amount] => 1
                                    [CurrencyCode] => GBP
                                    [FormattedPrice] => £0.01
                                )

                            [TotalNew] => 30
                            [TotalUsed] => 12
                            [TotalCollectible] => 0
                            [TotalRefurbished] => 0
                        )

                )

        )

)

Answer 1

You can use isset for checking object property:

if(isset($response->Items->Item->OfferSummary->LowestNewPrice)) {
    // LowestNewPrice exists
} else {
    // Doesn't exist or one of the properties doesn't exist
}

This way, you don't need to check each property individually.