erLhcoreClassModelUser::findOne PHP Method

    public static function findOne($paramsSearch = array())
    {
        $paramsSearch['limit'] = 1;
        $list = self::getUserList($paramsSearch);
        if (!empty($list)) {
            reset($list);
            return current($list);
        }
        return false;
    }

<?php

header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Headers: Origin, X-Requested-With, Content-Type, Accept');
header('Content-Type: application/json');
try {
    erLhcoreClassRestAPIHandler::validateRequest();
    if (isset($_GET['user_id']) && is_numeric($_GET['user_id'])) {
        $userData = erLhcoreClassModelUser::fetch((int) $_GET['user_id']);
    } elseif (isset($_GET['username']) && !empty($_GET['username'])) {
        $userData = erLhcoreClassModelUser::findOne(array('filter' => array('username' => $_GET['username'])));
    } elseif (isset($_GET['email']) && !empty($_GET['email'])) {
        $userData = erLhcoreClassModelUser::findOne(array('filter' => array('email' => $_GET['email'])));
    }
    if (!$userData instanceof erLhcoreClassModelUser) {
        throw new Exception('User could not be found!');
    }
    if ($_GET['status'] == 'true') {
        $userData->hide_online = 0;
        $text = 'flash_on';
    } else {
        $text = 'flash_off';
        $userData->hide_online = 1;
    }
    $userData->operation_admin .= "\$('#online-offline-user').text('" . $text . "');";
    erLhcoreClassUser::getSession()->update($userData);
    erLhcoreClassUserDep::setHideOnlineStatus($userData);
    erLhcoreClassRestAPIHandler::outputResponse(array('offline' => $userData->hide_online));
    erLhcoreClassChatEventDispatcher::getInstance()->dispatch('chat.operator_status_changed', array('user' => &$userData, 'reason' => 'rest_api'));
} catch (Exception $e) {
    echo json_encode(array('error' => true, 'result' => $e->getMessage()));