<?php $array = [ '2019-09-28' => [ 'A' => 4, 'B' => 85, 'C' => 200, ], '2019-09-29' => [ 'A' => 5, 'B' => 83, 'C' => 202, ] ]; $res = []; foreach ($array as $key => $item) { foreach ($item as $itemKey => $itemValue) { $res[$itemKey][$key] = $itemValue; } } print_r($res);
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