数组针对某项的求和有关问题

<br />
array (<br />
  0 => <br />
  array (<br />
    'stock_no' => 'SU13080800340',<br />
    'adress' => 'B',<br />
    'arr_time' => '2013-08-14 09:00:00',<br />
    'c_type' => 'P32E',<br />
    'cust_no' => '310F61VA5A',<br />
    'mount_total' => '1',<br />
    'total' => '16',<br />
    'c1_time' => '2013-08-10 15:00:00',<br />
    'packageno' => 'CVT121015001',<br />
  ),<br />
  1 => <br />
  array (<br />
    'stock_no' => 'SU13080800340',<br />
    'adress' => 'B',<br />
    'arr_time' => '2013-08-14 09:00:00',<br />
    'c_type' => 'P32E',<br />
    'cust_no' => '310F61VA5B',<br />
    'mount_total' => '2',<br />
    'total' => '32',<br />
    'c1_time' => '2013-08-10 15:00:00',<br />
    'packageno' => 'CVT121015002',<br />
  ),<br />
  2 => <br />
  array (<br />
    'stock_no' => 'SU13080800340',<br />
    'adress' => 'B',<br />
    'arr_time' => '2013-08-14 09:00:00',<br />
    'c_type' => 'P32E',<br />
    'cust_no' => '310F61VA5B',<br />
    'mount_total' => '2',<br />
    'total' => '32',<br />
    'c1_time' => '2013-08-10 15:00:00',<br />
    'packageno' => 'CVT121226001',<br />
  ),<br />
)<br />