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<?php $a = [ '2019-09-28' => [ 'A' => 4, 'B' => 85, 'C' => 200 ], '2019-09-29' => [ 'A' => 5, 'B' => 83, 'C' =>202 ] ]; array_walk($a, function($v,$k) use (&$r){ array_walk($v,function($v1,$k1) use (&$r,$k){ $r[$k1][$k] = $v1; }); }); print_r($r);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [A] => Array ( [2019-09-28] => 4 [2019-09-29] => 5 ) [B] => Array ( [2019-09-28] => 85 [2019-09-29] => 83 ) [C] => Array ( [2019-09-28] => 200 [2019-09-29] => 202 ) )

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