how to get value from response in fcm push notification in php

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{
    "multicast_id":8453676721258445896,
    "success":0,
    "failure":1,
    "canonical_ids":0,
    "results":[{
        "error":"InvalidRegistration"
    }]
}

How can i get only success and failure value in one variable in php

push-notification php
1 Answers
$res ='{"multicast_id":8453676721258445896,"success":0,"failure":1,"canonical_ids":0,"results":[{"error":"InvalidRegistration"}]}';
$json_array=json_decode($res,true);

$success = $json_array["success"];
$failure = $json_array["failure"];
echo $success;
echo $failure;
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