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<?php // median code: //http://www.mdj.us/web-development/php-programming/calculating-the-median-average-values-of-an-array-with-php/ function calculate_median($arr) { sort($arr); $count = count($arr); //total numbers in array $middleval = floor(($count-1)/2); // find the middle value, or the lowest middle value if($count % 2) { // odd number, middle is the median $median = $arr[$middleval]; } else { // even number, calculate avg of 2 medians $low = $arr[$middleval]; $high = $arr[$middleval+1]; $median = (($low+$high)/2); } return $median; } $a = []; $a["2017-05-01"] = ["DC"]; $a["2017-05-01"]["DC"]["IT"] = [90,0]; $a["2017-05-01"]["DC"]["DE"] = [18,315,40,"",69]; $a["2017-05-01"]["DC"]["Other"] = [107,46,"","",27,22]; function sort_by_order ($a, $b) { if ($a == "") $a = 0; if ($b == "") $b = 0; return $a - $b; } function test($item,$key){ echo $key," "; if (is_array($item)) { echo array_keys($item)[1],"\n"; $popped = array_pop($item); foreach ($popped as $key => $arr) { usort($arr, 'sort_by_order'); echo "Median ($key): ",calculate_median( $arr ),"\n"; } } } array_walk($a, 'test');