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<?php $data='{"multicast_id":7917175795873320166,"success":6,"failure":0,"canonical_ids":4, "results":[ {"registration_id":"3","message_id":"m1"}, {"message_id":"m1"}, {"message_id":"m1"}, {"registration_id":"3","message_id":"m1"}, {"registration_id":"3","message_id":"m1"}, {"registration_id":"3","message_id":"m1"}]}'; $newData=json_decode($data); print_r(array_keys($newData->results));
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => 0 [1] => 1 [2] => 2 [3] => 3 [4] => 4 [5] => 5 )

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