Online PHP editor | output for UC1o0

<?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; } $a=[ '2017-05-01'=>[ 'DC'=>[ 'IT'=>[90,0], 'DE'=>[18,315,40,"",69,211], 'Other'=>[107,46,"","",27,22] ] ], '2017-05-02'=>[ 'DC'=>[ 'IT'=>[70,40,55], 'DE'=>["",31,4,"",9], 'Other'=>[1107,12,0,20,1,11,21] ] ] ]; function sort_by_order ($a, $b) { if ($a == "") $a = 0; if ($b == "") $b = 0; return $a - $b; } function test($item,$key){ echo "\n",$key," "; if (is_array($item)) { echo array_keys($item)[0],"\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');