既知の配列を条件に応じて複数の新しい配列に分割します

既知の配列を条件に従って複数の新しい配列に分割します
既知の配列:

array (<br />
  0 => <br />
  array (<br />
    'po_num' => 'DYNP-770266110-00',<br />
    'plant' => 'DYNP',<br />
    'get_date' => '2013-09-09',<br />
    'cust_no' => '12654172',<br />
    'total' => '615',<br />
    'snp' => '15',<br />
    'mount' => '41',<br />
    'lp_no' => 'P000000D',<br />
  ),<br />
  1 => <br />
  array (<br />
    'po_num' => 'DYNP-770266110-00',<br />
    'plant' => 'DYNP',<br />
    'get_date' => '2013-09-09',<br />
    'cust_no' => '12647212',<br />
    'total' => '60',<br />
    'snp' => '15',<br />
    'mount' => '4',<br />
    'lp_no' => 'P000000D',<br />
  ),<br />
)

フィールドの合計が 100 であることに基づいて、配列をいくつかの新しい配列に分割できますか?そして、その中に次のようなシリアル番号フィールドを追加します:

<br />
  array (<br />
    'po_num' => '1/7',//新增字段信息<br />
    'po_num' => 'DYNP-770266110-00',<br />
    'plant' => 'DYNP',<br />
    'get_date' => '2013-09-09',<br />
    'cust_no' => '12654172',<br />
    'total' => '615',<br />
    'snp' => '15',<br />
    'mount' => '41',<br />
    'lp_no' => 'P000000D',<br />
  ),<br />
...<br />
）

共有先:
-----解決策--------------------------------
また？

$ar = array (<br />
  0 => <br />
  array (<br />
    'po_num' => 'DYNP-770266110-00',<br />
    'plant' => 'DYNP',<br />
    'get_date' => '2013-09-09',<br />
    'cust_no' => '12654172',<br />
    'total' => '615',<br />
    'snp' => '15',<br />
    'mount' => '41',<br />
    'lp_no' => 'P000000D',<br />
  ),<br />
  1 => <br />
  array (<br />
    'po_num' => 'DYNP-770266110-00',<br />
    'plant' => 'DYNP',<br />
    'get_date' => '2013-09-09',<br />
    'cust_no' => '12647212',<br />
    'total' => '60',<br />
    'snp' => '15',<br />
    'mount' => '4',<br />
    'lp_no' => 'P000000D',<br />
  ),<br />
);

$split_num = 100;

foreach($ar as $item) {

  if($item['total'] <= $split_num) {

    $res[] = $item;

    continue;

  }

  $total = $item['total'];

  $n = ceil($total/$split_num);

  for($i=1; $i<$n; $i++) {

    $res[] = array_merge(array('po_nume' => "$i/$n"), $item, array('total' => $split_num));

  }

  $res[] = array_merge(array('po_nume' => "$i/$n"), $item, array('total' => $total%$split_num));

}

print_r($res);

配列<br>
(<br>
[0] => 配列<br>
(<br>
[po_nume] => 1/7<br>
[PO_NUM] = & GT; 770266110-00 <br>
[植物] =>
[get_date] =＆gt;
[顧客番号] => 12654172<br>
[合計] =>
[SNP] = & GT; <br>
[マウント] =>
[lp_no] =>P000000D<br>
)<br>
<br>
[1] => 配列<br>
(<br>
[po_nume] => 2/7<br>
[po_num] => DYNP-770266110-00 <br><br>