如何自动合计/总和(第一个输入列数字+第二个输入列数字)在蛋糕php

Oven        ON         OFF       Total
........................................
A           20         20         40 (AUTO Sum, array readonly)
B           10         10         20
C           12         30         42  
D           15         15         30

目前我已经在cakephp中创建了ON和OFF的输入列。我想添加一个总列，当我输入ON和OFF列时，它将自动求和。现在我不确定如何做总函数。

下面是我的代码:

查看CTP文件

<?php echo $this->Form->input('B_On_R01', 
                              array('label' => false, 
                              'error'       => false, 
                              'tabindex'    => 3)); ?>
<?php echo $this->Form->input('B_Off_R01', 
                              array('label' => false, 
                              'error'       => false, 
                              'tabindex'    => 3)); ?>
<?php echo $this->Form->input('B_Total_R01', 
                              array('readonly' => 'readonly',
                              'label'          => false, 
                              'error'          => false, 
                              'tabindex'       => 3)); ?>

燃烧器控制器

if($i < 10) { $j = '0' . $i; } 
else { $j = $i; }
    if(isset($this->request->data['Burner']['B_On_R' . $j]))
        {
        $this->request->data['Burner']['Oven'] = 
        $this->request->data['Burner']['Item_R' . $j];
        $this->request->data['Burner']['B_On'] = 
        $this->request->data['Burner']['B_On_R' . $j];
        }
    else
        if($i < 10) { $j = '0' . $i; } else { $j = $i; }
             if(isset($this->request->data['Burner']['B_Off_R' . $j]))
                {
                $this->request->data['Burner']['Oven'] =   
                $this->request->data['Burner']['Item_R' . $j];
                $this->request->data['Burner']['B_Off'] = 
                $this->request->data['Burner']['B_Off_R' . $j];
                }
        else
            if($i < 10) { $j = '0' . $i; } else { $j = $i; }
               if(isset($this->request->data['Burner']['B_Total_R' . $j]))
                {
                $this->request->data['Burner']['Oven'] = 
                $this->request->data['Burner']['Item_R' . $j];
                $this->request->data['Burner']['B_Total'] =   
                $this->request->data['Burner']['B_Total_R' . $j];
                }