PHP function suggestion need - php

Question

I am little confused in making one function in my PHP page. Actually I want make one function which can transfer value from Filed A to filed B.
My current code is like below
<table class="table table-hover table-bordered">
<thead>
<tr>
<th>S.No.</th>
<th>Profile</th>
<th>Username</th>
<th>Email</th>
<th>Name</th>
<th>Mobile</th>
<th>Requested Credit</th>
<th>Action</th>
</tr>
</thead>
<tbody>
<?php if(mysqli_num_rows($result) > 0) { ?>
<?php $s=1; while($row = mysqli_fetch_assoc($result)) { ?>
<tr>
<td><?php echo $s;?></td>
<td><img class="img-thumbnail" style="height:50px;width:50px;" src="<?php echo $row['user_image']; ?>" alt="userimg" ></td>
<td><?php echo $row['username']; ?></td>
<td><?php echo $row['email']; ?></td>
<td><?php echo $row['name']; ?></td>
<td><?php echo $row['mobile']; ?></td>
<td><?php echo $row['request_redeem']; ?></td>
<td> <button onClick="reply(<?php echo $row['user_id'];?>);" class="btn btn-xs " type="button" ><i aria-hidden="true" class="fa fa-thumbs-down"> Approve</i></button> </td>
</tr>
<?php $s++; } ?>
<?php } ?>
</tbody>
in this request_redeem is value which I want transfer in filed called Credit. Both filed is in same database table. Can anyone please suggest me what should I do for it ? I am newbie and learning PHP yet...so Please let go my foolish questions if you think. Thanks

Answer 1

You should call $.ajax function on click on button.Like this:
$.ajax({ url: '/my/site',
data: {action: 'test'},
type: 'post',
success: function(output) {
alert(output);
}
});
Through ajax function on given url, you can create function there and update value in that function and return response that would update value in above view.

Answer 2

Manish has given good example for sending the ajax request . You write a SQL query on the request url to update those values.