Online PHP editor | refs for 58bJ7

<?php $arr =array( array(1,22,3,6,3), array(4,16,2,10,1), array(11,2,3,5,9), array(3,8,12,4,8) ); function vhall_sort($arr){ $a=$new=array(); foreach($arr as $k=>$v){ $num=array_sum($v); $a[$k]=$num/count($v); } arsort($a); foreach ($a as $k=>$v){ $new[$k] = $arr[$k]; } return $new; } echo '<pre>'; print_r($arr); print_r(vhall_sort($arr));