<?php $array = [ [ "a" => 0.333, "b" => 0.730, "c" => 0.393 ], [ "a" => 0.323, "b" => 0.454, "c" => 0.987 ], [ "a" => 0.753, "b" => 0.983, "c" => 0.123 ] ]; var_export( array_reduce( array_keys($array[0] ?? []), fn($result, $k) => $result + [$k => array_sum($c = array_column($array, $k)) / count($c)], [] ) );
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