public function distanceLookup(GeoLocation $source, GeoLocation $destination)
{
$data = array('from' => urlencode($source->getLatitude() && $source->getLongitude() ? strval($source) : $source->getAddress()), 'to' => urlencode($destination->getLatitude() && $destination->getLongitude() ? strval($destination) : $destination->getAddress()), 'apiKey' => $this->apiKey);
$url = $this->formatUrl(self::URL_DISTANCE_LOOKUP, $data, true);
$apiResult = json_decode($this->callUrl($url), true);
if ($this->hasError($apiResult, false)) {
return null;
}
$totalDist = 0;
if (count($apiResult['route']['legs'])) {
foreach ($apiResult['route']['legs'] as $leg) {
$totalDist += $leg['distance'];
}
$totalDist = $totalDist * 1000;
//cast to meters
} else {
$totalDist = -1;
}
return $totalDist;
}
public static function haversineGreatCircleDistance(GeoLocation $from, GeoLocation $to)
{
// convert from degrees to radians
$latFrom = deg2rad($from->getLatitude());
$lonFrom = deg2rad($from->getLongitude());
$latTo = deg2rad($to->getLatitude());
$lonTo = deg2rad($to->getLongitude());
$latDelta = $latTo - $latFrom;
$lonDelta = $lonTo - $lonFrom;
$angle = 2 * asin(sqrt(pow(sin($latDelta / 2), 2) + cos($latFrom) * cos($latTo) * pow(sin($lonDelta / 2), 2)));
return $angle * self::EARTH_RADIUS;
}