Online PHP editor | output for dn5ro

<?php $input = [ 0 => [ 'one' => 10, 'two' => 20, 'three' => 50, 'four' => 80, 'five' => 100], 1 => [ 'three' => 20, 'five' => 20, 'six' => 100, 'seven' => 10], 2 => [ 'one' => 30, 'three' => 30, 'five' => 10, 'eight' => 10] ]; $combined = []; foreach($input as $array) { foreach($array as $key => $value) { $combined[$key][] = $value; } } $combined = array_filter($combined, function($v, $k) { return count($v) != 1; }, ARRAY_FILTER_USE_BOTH ); $averages = array_map(function($item) { return array_sum($item)/count($item); }, $combined); var_dump($averages);