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<?php $intersecting_arrays = Array ( 0 => Array ( 'one' => 10, 'two' => 20, 'three' => 50, 'four' => 80, 'five' => 100 ), 1 => Array ( 'three' => 20, 'five' => 20, 'six' => 100, 'seven' => 10 ), 2 => Array ( 'one' => 30, 'three' => 30, 'five' => 10, 'eight' => 10 ) ); $temp = $intersecting_arrays[0]; for($i = 1; $i < count($intersecting_arrays); $i++) { $temp = array_intersect_key($temp, $intersecting_arrays[$i]); } $result = Array(); foreach(array_keys($temp) as $key => $val) { $value = 0; foreach($intersecting_arrays as $val1) { $value+= $val1[$val]; } $result[$key] = $value / count($intersecting_arrays); } print_r($temp); print_r($result);
Output for 7.0.0 - 7.0.25, 7.1.0 - 7.1.33, 7.2.6 - 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 - 8.3.7
Array ( [three] => 50 [five] => 100 ) Array ( [0] => 33.333333333333 [1] => 43.333333333333 )

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