我正在制定一个计划，根据每个员工的出勤情况计算他们的膳食津贴。这是我现在掌握的数据，一个叫做出勤率的表格。这个表格是由我导入的csv文件填充的，下面是我导入csv的代码

function uploadData()
{
    $fp = fopen($_FILES['userfile']['tmp_name'],'r') or die("can't open file");
    // Ignore header line
    $header = fgetcsv($fp);
    // Array to store the partial records
    $attendance= [];
    while($csv_line = fgetcsv($fp))
    {
        // Key to identify first part of record (Name and date)
        $key = $csv_line[1]."/".$csv_line[3];
        if ( isset($attendance[$key]) ){
            $start = $attendance[$key];
            // Extract data from first part of record and add in end date from current row
            $data = array(
                'id_attend' => $start[0] ,
                'emp_code' => $start[1],
                'emp_name' => $start[2],
                'date' => $start[3],
                'time_in' => $start[4],
                'time_out' => $csv_line[4],
            );
            $data['crane_features']=$this->db->insert('attendance', $data);
            // Remove partial record
            unset($attendance[$key]);
        }
        else    {
            // Store partial record
            $attendance[$key] = $csv_line;
        }
    }
    fclose($fp) or die("can't close file");
    $data['success']="success";
}

这是我的table

|   id_attend   |   emp_code   |   emp_name   |   date   |  time_in |  time_out  |
----------------------------------------------------------------------------------
|   0001        |   brw        |   brown      |01.01.2001|  07.00   |    20.00   |
|   0002        |   cny        |   cony       |01.01.2001|  07.00   |    20.00   |
----------------------------------------------------------------------------------

我需要计算他们参加了多少天，并把它保存在我的数据库里。我已经有一张table作为一个容器，叫做零用钱

------------------------------------------------------------------------
|id_allowance(auto increment)|emp_code|emp_name|days_attended|allowance|
------------------------------------------------------------------------
|          0001              |   brw  |  brown |       1     |  30.00  |
|          0002              |   cny  |  cony  |       1     |  30.00  |
------------------------------------------------------------------------

是否有任何方式的津贴将自动生成和更新每次我导入新的csv文件？因为津贴表本来应该是空的，真的要看考勤表