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<?php $str ='[{ "id": 1, "time": "2018-12-16", "pages_indexed": 1024 }, { "id": 2, "time": "2018-12-12", "something": 1024 }, { "id": 3, "time": "2018-12-09", "something": 7 }, { "id": 13, "time": "2018-11-08", "something": 7 }, { "id": 12, "time": "2018-11-12", "something": 7 }]'; $arr = json_decode($str, true); $time = array_column($arr, "time"); array_multisort($time, SORT_DESC, $arr); foreach(array_reverse($arr) as $sub){ $result[substr($sub["time"], 0, 7)]= $sub; } Var_dump($result);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { ["2018-11"]=> array(3) { ["id"]=> int(12) ["time"]=> string(10) "2018-11-12" ["something"]=> int(7) } ["2018-12"]=> array(3) { ["id"]=> int(1) ["time"]=> string(10) "2018-12-16" ["pages_indexed"]=> int(1024) } }

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