Panowie pobieram sobie json_decode tablice:

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stdClass Object
(
    [trackDetail] => Array
        (
            [0] => stdClass Object
                (
                    [trackingNumber] => xxx
                    [trackDate] => 2018-03-07
                    [trackPoint] => ERDINGTON PDO
                    [trackTime] => 07:16:00
                    [messages] => Array
                        (
                        )
 
                )
 
            [1] => stdClass Object
                (
                    [trackingNumber] => xxx
                    [trackDate] => 2018-03-06
                    [trackPoint] => ERDINGTON PDO
                    [trackTime] => 10:36:00
                    [messages] => Array
                        (
                        )
 
                )
 
            [2] => stdClass Object
                (
                    [trackingNumber] => xxx
                    [trackDate] => 2018-03-05
                    [trackPoint] => Wath-Upon-Dearne S63 7PU
                    [trackTime] => 12:24:00
                    [messages] => Array
                        (
                        )
 
                )
 
        )
 
)
[HTML] pobierz, plaintext 

chciałbym teraz pobrać pierwszy trackDate i ostatni trackDate (tzn kiedy wysłano i kiedy doręczono)
Próbuje w ten sposób ale coś nie idzie:

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$test = json_decode($response);
$doreczono = $test->trackDetail[0]->trackDate; //wyświetla 
$wyslano = end($test->trackDetail[0]->trackDate); //nie wyświetla
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echo end($test->trackDetail)->trackDate;
[PHP] pobierz, plaintext 

Tak nie lepiej?