Online PHP editor | refs for 4NONP

<?php $arr = array( array('num'=>5,'period'=>3), array('num'=>10,'period'=>3), array('num'=>15,'period'=>9) ); $temp = array(); foreach($arr as $item) { list($n, $p) = array_values($item);print_r($p);print_r($n); $temp[$p] = array_key_exists($p, $temp) ? $temp[$p]+$n : $n; } print_r($temp); $arr = array(); foreach($temp as $p => $n) $arr[] = array('num'=>$n, 'period'=>$p); print_r($arr);