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@ 2019-10-01T13:27:16Z

<?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
Performance
VLD
References
Branches

print_r: documentation ( source)
array_walk: documentation ( source)

preferences:dark modelive previewkey bindings

27.38 ms | 405 KiB | 5 Q