Question

我有一个名为tbl_grade的表，其中包含此数据，例如

id   | studentid   |   compid   |  grade
1    | 1009123456  |     1      |  90
2    | 1009123457  |     2      |  95
3    | 1009123458  |     2      |  90

我的模型中有这行代码

public function gradeSum($studentid)
{
    $this->db->where('studentid',$studentid);
    $query = $this->db->get('tbl_grade');
    return $query->result();
}

在我看来：

<?php foreach ($this->UserModel->gradeSum($student->studentid) as $studentgrade):
   if($studentgrade->compid==2){
       echo $studentgrade->grade; //the code for the addition of the grades should be put here but for the meantime i just echoed the grades
   }
endforeach;?>

foreach声明会给我95和90，这是正确的。但我想回应它的总和。我把echo $sum->grade + $sum->grade;但显然它没有用，所以正确的语法是什么，以便我可以回显值的总和？

Answer 1

只需使用temp var进行添加

  <?php 
    $mySum = 0;
    foreach ($this->UserModel->gradeSum($student->studentid) as $studentgrade):
    if($studentgrade->compid==2){
         echo $studentgrade->grade; //the code for the addition of the grades should be put here but for the meantime i just echoed the grades
         $mySum = $mySum + $studentgrade->grade;
    }
    endforeach;
    echo $mySum;
?>

如何在foreach语句中添加值（PHP）

1 个答案: