I am trying to update the rank column in the users table in my database by presenting data in a PHP form and using a button to submit. However once i edit the data in my PHP form and press submit, the data in the database remains unchanged. I'm adding a (link to the) picture of the webpage, and the code is posted below.
Webpage image
<!DOCTYPE HTML>
<html>
<head>
<title>View Records</title>
</head>
<body>
<?php
/*
Displays all data from 'users' table
*/
// connect to the database
include('../db/connect.php');
// get results from database
$result = $MySQLi_CON->query("SELECT * FROM users")
or die(mysql_error());
// display data in table
echo "<table border='1' cellpadding='10'>";
echo "<tr> <th>ID</th> <th>Username</th> <th>Email</th> <th>Rank</th> <th></th></tr>";
// loop through results of database query, displaying them in the table
while($row = $result->fetch_array()) {
// echo out the contents of each row into a table
echo "<tr>";
echo '<td>' . $row['user_id'] . '</td>';
echo '<td>' . $row['username'] . '</td>';
echo '<td>' . $row['email'] . '</td>';
echo '<td><input type="hidden" name="user_id[]" id="newrank" width="20px" min="0" max="100" value="' . $row['user_id'] . '"></td>';
echo '<td><form method="POST" action=""><input type="number" name="newrank[]" id="newrank" width="20px" min="0" max="100" value="' . $row['rank'] . '"></form></td>';
echo '<td><a href="delete.php?id=' . $row['user_id'] . '">Delete</a></td>';
echo "</tr>";
}
// close table>
echo "</table>";
if(isset($_POST['btn-update'])) {
for($i = 0; count($_POST["user_id"]); $i++) {
$_POST['newrank'][$i] = $MySQLi_CON->real_escape_string($_POST['newrank'][$i]); # If this function exists either, if not comment or remove this line!
$_POST['user_id'][$i] = $MySQLi_CON->real_escape_string($_POST['user_id'][$i]); # If this function exists either, if not comment or remove this line!
$MySQLi_CON->query('UPDATE users SET rank=' . $_POST['newrank'][$i] . ' WHERE user_id=' . $row['user_id'][$i] . '');
}
echo "Updated the rows.";
}
?>
<br>
<button type="submit" class="btn btn-default" name="btn-update" id="btn-update">Update</button></a>
<p><a href="ny.php">Add a new record</a></p>
</body>
</html>
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