function Update_EWD_FEUP_Content()
{
    global $feup_message;
    if (isset($_GET['Action'])) {
        switch ($_GET['Action']) {
            case "EWD_FEUP_AddUser":
            case "EWD_FEUP_EditUser":
                $feup_message = Add_Edit_User();
                break;
            case "EWD_FEUP_DeleteUser":
                $feup_message = Delete_EWD_FEUP_User($_GET['User_ID']);
                break;
            case "EWD_FEUP_MassUserAction":
                $feup_message = EWD_FEUP_Mass_User_Action();
                break;
            case "EWD_FEUP_DeleteAllUsers":
                $feup_message = Delete_All_EWD_FEUP_Users();
                break;
            case "EWD_FEUP_AddUserSpreadsheet":
                $feup_message = Add_Users_From_Spreadsheet();
                break;
            case "EWD_FEUP_AddField":
            case "EWD_FEUP_EditField":
                $feup_message = Add_Edit_Field();
                break;
            case "EWD_FEUP_DeleteField":
                $feup_message = Delete_EWD_FEUP_Field($_GET['Field_ID']);
                break;
            case "EWD_FEUP_MassDeleteFields":
                $feup_message = Mass_Delete_EWD_FEUP_Fields();
                break;
            case "EWD_FEUP_AddLevel":
            case "EWD_FEUP_EditLevel":
                $feup_message = Add_Edit_Level();
                break;
            case "EWD_FEUP_DeleteLevel":
                $feup_message = Delete_EWD_FEUP_Level($_GET['Level_ID']);
                break;
            case "EWD_FEUP_MassDeleteLevels":
                $feup_message = Mass_Delete_EWD_FEUP_Levels();
                break;
            case "EWD_FEUP_UpdateOptions":
                $feup_message = Update_EWD_FEUP_Options();
                break;
            case "EWD_FEUP_UpdateEmailSettings":
                $feup_message = Update_EWD_FEUP_Email_Settings();
                break;
            case "EWD_FEUP_ExportToExcel":
                $feup_message = EWD_FEUP_Export_To_Excel();
                break;
            case "EWD_FEUP_OneClickInstall":
                $feup_message = EWD_FEUP_One_Click_Install();
                break;
            default:
                //$feup_update_message = __("The form has not worked correctly. Please contact the plugin developer.", 'EWD_FEUP');
                break;
        }
    }
}
function Delete_All_EWD_FEUP_Users()
{
    global $wpdb, $ewd_feup_user_table_name;
    $Users = $wpdb->get_results("SELECT User_ID FROM {$ewd_feup_user_table_name}");
    if (is_array($Users)) {
        foreach ($Users as $User) {
            if ($User->User_ID != "") {
                Delete_EWD_FEUP_User($User->User_ID);
            }
        }
    }
    $update = __("Users have been successfully deleted.", 'EWD_OTP');
    $user_update = array("Message_Type" => "Update", "Message" => $update);
    return $user_update;
}