php foreach迴圈判斷在改變值。坐等大神解決

    foreach ($gjtc as $key=>$val)    {        foreach ($gjtc2 as $key2=>$vals2)        {            if($key['order_id']==$key2['order_id'])            {            }        }    }

寫到這裡不會寫了,我要把2數組sp_tc相加根據1組的ID

回複內容：

    foreach ($gjtc as $key=>$val)    {        foreach ($gjtc2 as $key2=>$vals2)        {            if($key['order_id']==$key2['order_id'])            {            }        }    }

寫到這裡不會寫了,我要把2數組sp_tc相加根據1組的ID

直接用sql語句操作就好了，為什麼還要php寫迴圈去操作呢？

