Cannot delete row

Question

i have a page called member.php in php section, i write this code :

if(isset($_POST['delete-btn'])) {
    $uid = $_GET['delete'];
    $user->delete($uid);
    header("Location: member?deleted");
}

in form in html section i write this code :

<form method="post">
    <input type="hidden" name="uid" value="<?php echo $row_user['user_id']; ?>" />
    <button type="submit" class="btn" name="delete-btn">Delete</button>
</form>

$user->delete($uid); goes to class.user.php and the following code is :

public function delete($uid) {
    $stmt = $this->db->prepare("DELETE FROM members where user_id=:uid");
    $stmt->bindparam(":uid", $uid);
    $stmt->execute();
    return true;
}

When i try to use this code, the button disappear :

<?php
if(isset($_GET['delete'])) {
?>
    <form method="post">
        <input type="hidden" name="uid" value="<?php echo $row_user['user_id']; ?>" />
        <button type="submit" class="btn" name="delete-btn">Delete</button>
    </form>
<?php
}
?>

My question is, when i try to delete, the page refreshed and get member?deleted isn't that mean the affected row should be deleted ? But nothing happen, no one row deleted. Maybe what make this wrong is in the form, but i don't know what is it..

Answer 1

you have used post method. so for getting uid you have to use

$uid = $_POST['uid'];

instead of

$uid = $_GET['delete'];