51 lines
1.9 KiB
PHP
51 lines
1.9 KiB
PHP
<?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);
|
|
}
|
|
}
|