Get latitude longitude in drupal 8 based on city or zipcode

Geolocation provides latitude and longitude information. In order to search based on these values, when zipcode or city name is passed to this function, data is returned comma separated.
$lat_lan = module_name_get_latitue_longitude(‘delhi’);
$lat_lan = module_name_get_latitue_longitude(‘110001’);

/**
 * Get Latitude longitude.
 *
 * @param type $zip
 *   Zipcode
 *
 * @return string
 *   Returns latitude and longitude, if found.
 */
function module_name_get_latitue_longitude($zip) {
  $geolocation = \Drupal::service('geolocation.core');
  $geocoderManager = $geolocation->getGeocoderManager();
  $geocoder = $geocoderManager->getGeocoder('google_geocoding_api');
  $geocode = $geocoder->geocode($zip);
  $lat_lng = '';
  if (isset($geocode['location'])) {
    $lat_lng = $geocode['location']['lat'] . ',' . $geocode['location']['lng'];
  }
  return $lat_lng;
}