获取dompdf

Question

我有如下的出勤表。

ID      date_in     time_in     time_out
 1     2017-05-04   8.10        16.20
 1     2017-05-05   6.10        12.20
 5     2017-05-04   9.30        16.22
 5     2017-05-05   8.20        16.23
 ....

我希望每个员工获得搜索月份的小时数并打印报告，并且我使用dompdf进行报告。我想要的输出报告是：

 ID     Name     Total OTHours
 1      John      14.20
 5      Smith     22.20

我使用以下代码。但是，不工作的小时和pdf文件的总和不起作用。请有人帮我找到解决方案???

 $query = "
    SELECT * FROM employee_personal_details e
    INNER JOIN attendance_details a ON e.emp_id = a.emp_id
    WHERE MONTH(a.date_in) = '$monthSearch' 
    GROUP BY e.emp_id ";

     $result = mysqli_query($connect, $query);

       $output = "
            <table>
                <tr>
                <th>ID</th>
                <th>Name</th>
                <th>Total OT Hours</th>
                </tr>
               ";

while($row = mysqli_fetch_array($result)){

 $output .= '
  <tr>
   <td>'.$row["emp_id"].'</td>
   <td>'.$row["emp_fullName"].'</td>';


  //calculate the time difference 
  $datetime1 = new DateTime($row['time_out']);
  $datetime2 = new DateTime($row['time_in']);
  $interval = $datetime1->diff($datetime2);
  $workedHours = $interval->format('%h'.'.'.'%I');

    //expected hours 
    $expectedHour=8;

    //calculate the ot hours    
    $ot = $workedHours-$expectedHour;

    if($ot>0.3){
       $sumot += $ot;
    }


$output .= '
   <td>'.$sumot.'</td>     
  </tr>
 ';
}

  $output .= '</table>';

 //echo $output;
 $dompdf->loadHtml($output);