如何总结数组变量中的值？

Question

I have retrieved some values from database. In my view file I have the following:

 $row['fee_amount']; 

Now, I want to sum up all the values inside $row['fee_amount']; and then show it.

I know I could sum up when querying the database, but I am interested to learn how to add using PHP .

Would you please kindly teach me how to do it?

EDIT

    <?php if(count($records) > 0) { ?>              
        <table id="table1" class="gtable sortable">
            <thead>
                <tr>                        
                    <th>S.N</th>
                    <th>Fee Type</th>
                    <th>Fee Amount</th>                         
                </tr>
            </thead>
            <tbody>             
                <?php $i = 0; foreach ($records as $row){ $i++; ?>
                    <tr>
                        <td><?php echo $i; ?>.</td>
                        <td><?php echo $row['fee_type'];?></td>                                                
                        <td><?php echo $row['fee_amount'];?></td>                                           
                    </tr>                                                                                          
                <?php  } ?>             
            </tbody>                
            <tr>                                                        
                <td></td>
                <td>Total</td>
                <td> 
                    I WANT TO DISPLAY THE SUMMATION RESULT HERE ADDING UP VALUES INSIDE THIS>>> <?  $row['fee_amount']; ?> 
                </td>                                                                               
            </tr>               
        </table>
    <?php } ?>

Answer 1

In your view file, with your foreach loop, add a $sum variable next to your $i counter and add the amount per each iteration (similar to like you increase $i):

<?php
    $i = 0;
    $sum = 0;
    foreach ($records as $row)
    { 
        $i++; 
        $sum += $row['fee_amount']; ?>

(I put this over multiple lines to make it more readable).

After the foreach has finished, $sum contains the total amount:

        <td>Total: <?php echo $sum; ?></td>

That simple it is. You only need a new variable ($sum) and do the calculation.