/install/core/actions/settingsTest.php

<?php
/************************************************************************
 * This file is part of EspoCRM.
 *
 * EspoCRM - Open Source CRM application.
 * Copyright (C) 2014-2015 Yuri Kuznetsov, Taras Machyshyn, Oleksiy Avramenko
 * Website: http://www.espocrm.com
 *
 * EspoCRM is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * EspoCRM is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with EspoCRM. If not, see http://www.gnu.org/licenses/.
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU General Public License version 3.
 *
 * In accordance with Section 7(b) of the GNU General Public License version 3,
 * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
 ************************************************************************/

ob_start();

$result = array('success' => true, 'errors' => array());

$res = $systemHelper->checkRequirements();
$result['success'] &= $res['success'];
if (!empty($res['errors'])) {
	$result['errors'] = array_merge($result['errors'], $res['errors']);
}

if ($result['success'] && !empty($_REQUEST['dbName']) && !empty($_REQUEST['hostName']) && !empty($_REQUEST['dbUserName'])) {
	$connect = false;

	$dbName = trim($_REQUEST['dbName']);
	if (strpos($_REQUEST['hostName'],':') === false) {
		$_REQUEST['hostName'] .= ":";
	}
	list($hostName, $port) = explode(':', trim($_REQUEST['hostName']));
	$dbUserName = trim($_REQUEST['dbUserName']);
	$dbUserPass = trim($_REQUEST['dbUserPass']);

	$res = $systemHelper->checkDbConnection($hostName, $port, $dbUserName, $dbUserPass, $dbName);
	$result['success'] &= $res['success'];
	if (!empty($res['errors'])) {
		$result['errors'] = array_merge($result['errors'], $res['errors']);
	}

}

ob_clean();
echo json_encode($result);