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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 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.4, 8.3.6 - 8.3.7
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 ) )
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 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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