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<?php $source_json = <<<JSON { "success": true, "test2": [ [ [ { "nama": "Henru Kay", "date": "29 Apr 2019" }, { "nama": "B", "date": "28 Apr 2019" } ] ], [ [ { "nama": "C", "date": "25 Apr 2019" } ] ] ] } JSON; $array = json_decode($source_json, true); $array['test2'] = array_merge(...array_merge(...$array['test2'])); echo json_encode($array, JSON_PRETTY_PRINT);

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