访问php对象数组的单个值

Question

I call an api and the response i get is

Array (
    [meta] => Array ( 
        [code] => 200 
        [type] => Success 
        [message] => Success 
    ) 
    [data] => Array (
        [items] => Array (
            [0] => Array ( 
                [id] => b4a235596fd9550dfb69f181f4db007f 
                [tracking_number] => 2649884668232181 
                [carrier_code] => hermes 
                [order_create_time] => 
                [destination_code] => 
                [status] => delivered 
                [track_update] => 
                [original_country] => 
                [itemTimeLength] => 7 
                [stayTimeLength] => 74 
                [service_code] => 
                [packageStatus] => 
                [substatus] => 
                [last_mile_tracking_supported] => 
                [origin_info] => Array ( 
                    [ItemReceived] => 2019-04-09 09:29 
                    [ItemDispatched] => 
                    [DepartfromAirport] => 
                    [ArrivalfromAbroad] => 
                    [CustomsClearance] => 
                    [DestinationArrived] => 
                    [weblink] => https://www.hermesworld.com/en/ 
                    [phone] => 
                    [carrier_code] => hermes 
                    [trackinfo] => Array ( 
                        [0] => Array ( 
                                [Date] => 2019-04-15 11:51 
                                [StatusDescription] => Posted through letterbox 
                                [Details] => 
                                [checkpoint_status] => delivered 
                            ) 
                            [1] => Array (
                                [Date] => 2019-04-15 09:45 
                                [StatusDescription] => Delivery will be attempted between 10:00 and 14:00 today 
                                [Details] => 
                                [checkpoint_status] => transit 
                            ) 
                            [2] => Array ( 
                                [Date] => 2019-04-15 06:39 
                                [StatusDescription] => On its way to the courier 
                                [Details] => 
                                [checkpoint_status] => transit 
                            ) 
                            [3] => Array ( 
                                [Date] => 2019-04-14 22:33 
                                [StatusDescription] => At the customers local depot 
                                [Details] => 
                                [checkpoint_status] => transit 
                            )
                            .....
                    ) 
                ) 
                [destination_info] => 
                [lastEvent] => Posted through letterbox,2019-04-15 11:51 
                [lastUpdateTime] => 2019-04-15 11:51 
            )
        ) 
    ) 
) 1 

I would like to access the value of checkpoint_status but im not getting there using the following ways:

response in variable 
$track = print_r($track);

1. $track['checkpoint_status']
2. $track[0] // just to see if it returns anything, but no result
3. $track[1] // just to see if it returns anything, but no result
4. array_column($track, 'checkpoint_status'); // returns nothing

Answer 1

You need to loop, to get all checkpoint_status

foreach($array['data']['items'] as $item){
   foreach($item['origin_info']['trackinfo'] as $trackinfo){
     echo $trackinfo['checkpoint_status'].PHP_EOL;
   }
}

Sample output:-https://3v4l.org/IM7I1