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