PHP MySQL update only updating last row with loop - php

Question

I have set up an update query which will update values entered into text fields on a while loop.Then for some reason only the last row data in the loop will be updated and the rest will stay the same.i know the issue .cause the the last attribute row overwrite the other in form so when update update only the last row
code
<?php
include'../config/connect.php';
$id = $_SESSION['agent'];
$sql = "Select * from nps where agent_id = '$id'";
$result = $cont->query($sql);
if ( $result->num_rows > 0 ){
?>
<form action="update.php" method="post">
<?php
while($row = $result->fetch_assoc()){
?>
<tr>
<td> <?php echo $row['date']; ?> </td>
<td> <?php echo $row['phone']; ?> </td>
<td> <?php echo $row['survey_date']; ?> </td>
<td> <input type="hidden" name="id" value="<?php echo $row['agent_id']; ?>"> <?php echo $row['agent_id']; ?> </td>
<td> <?php echo $row['agent_name']; ?> </td>
<td> <?php echo $row['nps_rating']; ?> </td>
<td> <?php echo $row['sats']; ?> </td>
<td> <?php echo $row['agent_satisfaction']; ?> </td>
<td> <?php echo $row['ir']; ?></td>
<td><textarea name="comment" ><?php echo $row['comment']; ?></textarea></td>
</tr>
<?php
}
};
?>
</table>
<div><input type="submit" name="submit" > </div>
</form>
update.php file
<?php
session_start();
include'../config/connect.php';
$comment = $_POST['comment'];
$id = $_POST['id'];
if($_POST['submit']){
$sql = "UPDATE nps SET comment='$comment' WHERE id='$id' ";
};
if ($cont->query($sql) === true){
echo 'done';
}else{
echo 'notdone';
}
?>

Answer 1

First of all, you have two input names: id and comment. Once submitted, the form will be processed from start to finish, meaning the values that are actually processed in your PHP will be the last ones.
You will want to make these unique, and since you’re ID is hidden, it is less important. My suggestion would be to dynamically create names, such as comment_{id} and than in your PHP with the query to update, you go through all of your $_POST values, replace out the comment_ from the key, and execute a query to update the values.
You are also open to SQL injection and should take steps to prevent that.

Answer 2

You must have have inputs with unique names. I suggest to make a input name from row’s ID and attribute name, as for e.g. comment will be like ‘1-comment’. Then in the update script you need to iterate over the data and make the update query for each data. Cheers.