How to update database's value after pressing button? - php

Question

I am currently working on my assignment, I am trying to create a ban system for users, I wanna update the value of Deleted in my database to 1 whenever I press the submit button, I tried many on youtube videos but has not given any process
$id = $_SESSION['UserID'];
$query = "SELECT * FROM Users WHERE UserID='$id'";
$result = mysqli_query($link, $query);
$row2 = mysqli_fetch_assoc($result);
if ($row2['Admin'] == 0) {
echo '<div class="alert alert-warning" role="alert">
Unfortunately you do not have access to this page
</div>';
}
else {
$query = " SELECT * FROM Users WHERE Admin = 0";
$result = mysqli_query($link, $query);
echo '<div class="container">';
echo '</div>';
echo '<div class="container"><table class="table table-primary table-hover">';
echo '<tr><th>' . 'NameID' . '</th><th>' . 'Name' . '</th><th>' . 'Email' . '</th><th>' . '</tr>';
while ($row2 = mysqli_fetch_assoc($result)) {
echo '<tr><td>' . $row2['UserID'] . ' </td><td> ' . $row2['FirstName'] . ' ' . $row2['LastName'] . ' </td><td> ' . $row2['EMail'] . ' </td><td> '
. '<input type="submit" name="submit" class="btn btn-primary btn-xs" value="BAN">' . ' </td></tr>';
}
if (isset($_POST['submit'])) {
echo '</table>' . '</div>';
$id = $_SESSION['UserID'];
$query = "SELECT * FROM Users WHERE UserID='$id'";
$result = mysqli_query($link, $query);
if ($_POST['submit']) {
$query2 = "UPDATE `Users` SET `Deleted` = '1' WHERE `Users`.`UserID` ='$id'";
}
}
}

Answer 1

You define $query2 but never execute it. This is a common mistake.
Tip: Don't declare SQL as strings and then run it later, get in the habit of supplying the query as a direct argument to prepare().
For example:
$stmt = $link->prepare('UPDATE `Users` SET `Deleted` = '1' WHERE `Users`.`UserID`=?');
$stmt->bind_param('i', $id);
$stmt->execute();

Answer 2

You don't run the $query2, do it like this
if ($_POST['submit']) {
$query2 = "UPDATE `Users` SET `Deleted` = '1' WHERE `Users`.`UserID` ='$id'";
mysqli_query($link, $query2);
}