32 lines
1.1 KiB
PHP
32 lines
1.1 KiB
PHP
<?php
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/**
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* Copyright (c) 2012 Georg Ehrke <ownclouddev at georgswebsite dot de>
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* This file is licensed under the Affero General Public License version 3 or
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* later.
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* See the COPYING-README file.
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*/
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class OC_Geo{
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/*
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* @brief returns the closest timezone to coordinates
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* @param (string) $latitude - Latitude
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* @param (string) $longitude - Longitude
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* @return (string) $timezone - closest timezone
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*/
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public static function timezone($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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