Online PHP editor | refs for V7KoB

<?php $obj = new stdClass(); $obj->id = ['a', 'b', 'a', 'c']; $obj->type = ['aaa', 'bbb', 'aaa', 'aaa']; $obj->num = [95, 100, 50, 11]; $sum = []; foreach($obj->id as $idx => $id) { if(!array_key_exists($id, $sum)) { $sum[$id] = []; } $sum[$obj->type[$id]] += $obj->num; } var_dump($sum);