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<?php $arr = array(array( "2"=> 6, "5"=> 1 ), array( "2"=> 1, "5"=> 3 )); $keys = array_keys(reset($arr)); $res = array_combine( $keys, array_map( fn ($k) => max(array_column($arr, $k)), $keys) ); print_r($res);
Output for 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.13
Array ( [2] => 6 [5] => 3 )
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