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<?php |
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namespace GeoTimeZone; |
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use DateTime; |
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use DateTimeZone; |
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use ErrorException; |
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use GeoTimeZone\Quadrant\Tree; |
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class Calculator |
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{ |
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protected $quadrantTree; |
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/** |
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* TimeZone constructor. |
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* @param $dataDirectory |
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* @throws ErrorException |
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*/ |
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public function __construct($dataDirectory = null) |
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{ |
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if (isset($dataDirectory) && is_dir($dataDirectory)) { |
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$this->quadrantTree = new Tree($dataDirectory); |
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$this->quadrantTree->initializeDataTree(); |
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}else{ |
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throw new ErrorException('Invalid data tree directory: ' . $dataDirectory); |
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} |
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} |
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/** |
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* Adjust the latitude value |
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* @param $latitude |
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* @return float|int |
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* @throws ErrorException |
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*/ |
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protected function adjustLatitude($latitude) |
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{ |
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$newLatitude = $latitude; |
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if (null == $latitude || abs($latitude) > Tree::MAX_ABS_LATITUDE) { |
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throw new ErrorException('Invalid latitude: ' . $latitude); |
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} |
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if (abs($latitude) == Tree::MAX_ABS_LATITUDE) { |
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$newLatitude = ($latitude <=> 0) * Tree::ABS_LATITUDE_LIMIT; |
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} |
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return $newLatitude; |
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} |
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/** |
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* Adjust longitude value |
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* @param $longitude |
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* @return float|int |
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* @throws ErrorException |
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*/ |
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protected function adjustLongitude($longitude) |
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{ |
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$newLongitude = $longitude; |
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if (null == $longitude || abs($longitude) > Tree::MAX_ABS_LONGITUDE) { |
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throw new ErrorException('Invalid longitude: ' . $longitude); |
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} |
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if (abs($longitude) == Tree::MAX_ABS_LONGITUDE) { |
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$newLongitude = ($longitude <=> 0) * Tree::ABS_LONGITUDE_LIMIT; |
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} |
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return $newLongitude; |
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} |
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/** |
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* Get timezone name from a particular location (latitude, longitude) |
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* @param $latitude |
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* @param $longitude |
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* @return string |
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*/ |
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public function getTimeZoneName($latitude, $longitude) |
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{ |
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$timeZone = Tree::NONE_TIMEZONE; |
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try { |
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$latitude = $this->adjustLatitude($latitude); |
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$longitude = $this->adjustLongitude($longitude); |
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$timeZone = $this->quadrantTree->lookForTimezone($latitude, $longitude); |
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}catch (ErrorException $error){ |
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echo $error->getMessage() . "\n"; |
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} |
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return $timeZone; |
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} |
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/** |
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* Get the local date belonging to a particular latitude, longitude and timestamp |
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* @param $latitude |
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* @param $longitude |
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* @param $timestamp |
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* @return DateTime |
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*/ |
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public function getLocalDate($latitude, $longitude, $timestamp) |
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{ |
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$timeZone = $this->getTimeZoneName($latitude, $longitude); |
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$date = new DateTime(); |
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$date->setTimestamp($timestamp); |
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if ($timeZone != Tree::NONE_TIMEZONE) { |
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$date->setTimezone(new DateTimeZone($timeZone)); |
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} |
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return $date; |
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} |
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/** |
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* Get timestamp from latitude, longitude and localTimestamp |
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* @param $latitude |
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* @param $longitude |
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* @param $localTimestamp |
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* @return mixed |
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*/ |
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public function getCorrectTimestamp($latitude, $longitude, $localTimestamp) |
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{ |
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$timestamp = $localTimestamp; |
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$timeZoneName = $this->getTimeZoneName($latitude, $longitude); |
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if ($timeZoneName != Tree::NONE_TIMEZONE) { |
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$date = new DateTime(); |
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$date->setTimestamp($localTimestamp); |
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if ($timeZoneName != null) { |
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$date->setTimezone(new DateTimeZone($timeZoneName)); |
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} |
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$timestamp = $date->getOffset() != false ? $localTimestamp - $date->getOffset() : $localTimestamp; |
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} |
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return $timestamp; |
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} |
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} |
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minube /
geo-timezone
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