function _weather_calculate_sunrise_sunset in Weather 7

Same name and namespace in other branches

1. 5.6 weather_parser.inc \_weather_calculate_sunrise_sunset()
2. 6.5 weather_parser.inc \_weather_calculate_sunrise_sunset()

Calculate the times of sunrise and sunset.

The times are GMT, so it's possible for the sunrise being at 16:48 while the sun sets at 7:06.

Parameters

object $metar: METAR data object, may be altered.

1 call to _weather_calculate_sunrise_sunset()

weather_parse_metar in ./weather_parser.inc

Parses a raw METAR data string.

File

./weather_parser.inc, line 626

Retrieves and parses raw METAR data and stores result in database.

Code

function _weather_calculate_sunrise_sunset(&$metar) {

  // Get the coordinates for this weather station.
  $location = db_query("SELECT latitude, longitude FROM {weather_icao} WHERE icao=:icao", array(
    ':icao' => $metar->icao,
  ))
    ->fetchAssoc();
  $reported_on = $metar->reported_on;

  // Initialize sunrise and sunset times.
  $metar->sunrise_on = NULL;
  $metar->sunset_on = NULL;
  $suninfo = date_sun_info($reported_on, $location['latitude'], $location['longitude']);

  // Handle special cases (no sunrise or sunset at all).
  if ($suninfo['sunrise'] == 0 and $suninfo['sunset'] == 0) {

    // Sun is always below the horizon. To indicate that the sun
    // does not rise, let sunrise_on be NULL and set sunset_on to today.
    $condition = 'night';
    $metar->sunset_on = $metar->reported_on;
  }
  elseif ($suninfo['sunrise'] == 1 and $suninfo['sunset'] == 1) {

    // Sun is always above the horizon. To indicate that the sun
    // does not set, let sunset_on be NULL and set sunrise_on to today.
    $condition = 'day';
    $metar->sunrise_on = $metar->reported_on;
  }
  else {

    // There is a sunrise and a sunset.
    // We don't need the exact second of the sunrise and sunset. Therefore, the
    // times are rounded to the next minute. We add 30 seconds and cut off the
    // seconds part.
    $metar->sunrise_on = round($suninfo['sunrise'] / 60) * 60;
    $metar->sunset_on = round($suninfo['sunset'] / 60) * 60;

    // Correctly handle northern and southern hemisphere.
    if ($suninfo['sunrise'] <= $suninfo['sunset']) {

      // This should be on the northern hemisphere.
      if ($reported_on >= $suninfo['sunrise'] and $reported_on < $suninfo['sunset']) {
        $condition = 'day';
      }
      else {
        $condition = 'night';
      }
    }
    else {

      // This should be on the southern hemisphere.
      if ($reported_on >= $suninfo['sunrise'] or $reported_on <= $suninfo['sunset']) {
        $condition = 'day';
      }
      else {
        $condition = 'night';
      }
    }
  }
  $metar->daytime_condition = $condition;
}