- print_r: documentation ( source)
- ceil: documentation ( source)
<?php
//$total_sum = array_sum(array_column($packageInfo,'total_weight'));
$total_sum = 26;
$boxes = ceil($total_sum/20); // count of boxes
for($i=0;$i<$boxes;$i++){
$res[$i]['box_item'] = ($total_sum - $i*20)>20 ? 20 : ($total_sum - $i*20);
}
print_r($res);