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<?php $objs = json_decode('"obj":{"a":{"key":"a", "value":2, "index":1}, "b":{"key":"b", "value":3, "index":2}}', true); var_dump($objs); $objs = array_column($objs, null, "key"); $objs['a']['value'] = 5; var_dump($objs);

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49.73 ms | 402 KiB | 5 Q