50 lines
1.9 KiB
PHP
50 lines
1.9 KiB
PHP
<?php
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/**
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* @author Christopher Schäpers <kondou@ts.unde.re>
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* @author Georg Ehrke <georg@owncloud.com>
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* @author Lukas Reschke <lukas@owncloud.com>
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* @author Morris Jobke <hey@morrisjobke.de>
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* @author Robin McCorkell <rmccorkell@karoshi.org.uk>
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* @author Scrutinizer Auto-Fixer <auto-fixer@scrutinizer-ci.com>
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* @author Thomas Müller <thomas.mueller@tmit.eu>
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*
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* @copyright Copyright (c) 2015, ownCloud, Inc.
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* @license AGPL-3.0
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*
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* This code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, version 3,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License, version 3,
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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*
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*/
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class OC_Geo{
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/**
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* returns the closest timezone to coordinates
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* @param float $latitude
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* @param float $longitude
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* @return mixed Closest timezone
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*/
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public static function timezone($latitude, $longitude) {
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$alltimezones = DateTimeZone::listIdentifiers();
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$variances = array();
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//calculate for all timezones the system know
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foreach($alltimezones as $timezone) {
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$datetimezoneobj = new DateTimeZone($timezone);
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$locationinformations = $datetimezoneobj->getLocation();
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$latitudeoftimezone = $locationinformations['latitude'];
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$longitudeoftimezone = $locationinformations['longitude'];
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$variances[abs($latitudeoftimezone - $latitude) + abs($longitudeoftimezone - $longitude)] = $timezone;
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}
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//sort array and return the timezone with the smallest difference
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ksort($variances);
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reset($variances);
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return current($variances);
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}
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}
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