public function logout_class($user_id, $class_id)
{
if (empty(self::$conn)) {
self::$conn = $this->connect_pdo();
}
$sql = "DELETE FROM join_class WHERE user_id=? AND class_id=?";
$stmt = self::$conn->prepare($sql);
$stmt->bindParam(1, $user_id);
$stmt->bindParam(2, $class_id);
if ($stmt->execute()) {
return true;
} else {
return false;
}
}
