PHP - retrieve first element of json string without converting to array -

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i have json string, probing follows:

$playedon = $query -> data -> artist -> services_played_on

i want first element of services_played_on, unsure how this.. if array i'd $query[data][artist][services_played_on][0], various reasons mess other code have. have ideas how can using -> notation?

-----edit-----

thanks answers, needed was:

$playedon = $query -> data -> artist -> services_played_on[0]

(i can't submit answer yet, 'new' user)

just decode json first.

$jset = json_decode($json, true); echo $jset["data"]["artist"]["services_played_on"][0];

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