$sql = "UPDATE $table_course_setting SET value = ".(int)$update_values['email_alert_tutor_on_new_user_in_course']." WHERE variable = 'email_alert_tutor_on_new_user_in_course' ";
$sql = "UPDATE $table_course_setting SET value = ".(int)$update_values['email_alert_manager_on_new_doc']." WHERE variable = 'email_alert_manager_on_new_doc' ";
$sql = "UPDATE $table_course_setting SET value = ".(int)$update_values['email_alert_manager_on_new_doc']." WHERE variable = 'email_alert_manager_on_new_doc' ";