Online PHP editor | output for QPsiS

<?php $collection = array( Array ( 'one' => 10, 'two' => 20, 'three' => 50, 'four' => 80, 'five' => 100 ), Array ( 'three' => 20, 'five' => 20, 'six' => 100, 'seven' => 10 ), Array ( 'one' => 30, 'three' => 30, 'five' => 10, 'eight' => 10 )); //$array = array_merge_recursive($arr1,$arr2,$arr3); $key= "three"; $array = array_column($collection, $key); If(count($array) != 1){ $avg = array_sum($array)/count($array); }Else{ $avg = $array[0]; } Echo $avg;