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<?php
/**
* @author Christopher Schäpers <kondou@ts.unde.re>
* @author Georg Ehrke <georg@owncloud.com>
* @author Lukas Reschke <lukas@owncloud.com>
* @author Morris Jobke <hey@morrisjobke.de>
* @author Robin McCorkell <rmccorkell@karoshi.org.uk>
* @author Scrutinizer Auto-Fixer <auto-fixer@scrutinizer-ci.com>
* @author Thomas Müller <thomas.mueller@tmit.eu>
*
* @copyright Copyright (c) 2015, ownCloud, Inc.
* @license AGPL-3.0
*
* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
class OC_Geo{
/**
* returns the closest timezone to coordinates
* @param float $latitude
* @param float $longitude
* @return mixed Closest timezone
*/
public static function timezone($latitude, $longitude) {
$alltimezones = DateTimeZone::listIdentifiers();
$variances = array();
//calculate for all timezones the system know
foreach($alltimezones as $timezone) {
$datetimezoneobj = new DateTimeZone($timezone);
$locationinformations = $datetimezoneobj->getLocation();
$latitudeoftimezone = $locationinformations['latitude'];
$longitudeoftimezone = $locationinformations['longitude'];
$variances[abs($latitudeoftimezone - $latitude) + abs($longitudeoftimezone - $longitude)] = $timezone;
}
//sort array and return the timezone with the smallest difference
ksort($variances);
reset($variances);
return current($variances);
}
}
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