date_sunset

(PHP 5, PHP 7)

date_sunset Returns time of sunset for a given day and location

Beschreibung

date_sunset ( int $timestamp [, int $returnFormat = SUNFUNCS_RET_STRING [, float $latitude = ini_get("date.default_latitude") [, float $longitude = ini_get("date.default_longitude") [, float $zenith = ini_get("date.sunset_zenith") [, float $utcOffset = 0 ]]]]] ) : mixed

date_sunset() returns the sunset time for a given day (specified as a timestamp) and location.

Parameter-Liste

timestamp

The timestamp of the day from which the sunset time is taken.

returnFormat

returnFormat constants
constant description example
SUNFUNCS_RET_STRING returns the result as string 16:46
SUNFUNCS_RET_DOUBLE returns the result as float 16.78243132
SUNFUNCS_RET_TIMESTAMP returns the result as int (timestamp) 1095034606

latitude

Defaults to North, pass in a negative value for South. See also: date.default_latitude

longitude

Defaults to East, pass in a negative value for West. See also: date.default_longitude

zenith

zenith is the angle between the center of the sun and a line perpendicular to earth's surface. It defaults to date.sunset_zenith

Common zenith angles
Angle Description
90°50' Sunset: the point where the sun becomes invisible.
96° Civil twilight: conventionally used to signify the end of dusk.
102° Nautical twilight: the point at which the horizon ends being visible at sea.
108° Astronomical twilight: the point at which the sun ends being the source of any illumination.

utcOffset

Specified in hours. The utcOffset is ignored, if returnFormat is SUNFUNCS_RET_TIMESTAMP.

Fehler/Exceptions

Jeder Aufruf der Datums- und Zeitfunktionen generiert eine E_NOTICE-Warnung, wenn die Zeitzone ungültig ist und eine E_STRICT-Nachricht oder eine E_WARNING-Warnung, wenn die Systemeinstellung oder die TZ-Umgebungsvariable genutzt wird. Siehe auch date_default_timezone_set()

Rückgabewerte

Returns the sunset time in a specified returnFormat on successIm Fehlerfall wird FALSE zurückgegeben.. One potential reason for failure is that the sun does not set at all, which happens inside the polar circles for part of the year.

Beispiele

Beispiel #1 date_sunset() example

<?php

/* calculate the sunset time for Lisbon, Portugal
Latitude: 38.4 North
Longitude: 9 West
Zenith ~= 90
offset: +1 GMT
*/

echo date("D M d Y"). ', sunset time : ' .date_sunset(time(), SUNFUNCS_RET_STRING38.4, -9901);

?>

Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

Mon Dec 20 2004, sunset time : 18:13

Beispiel #2 No sunset

<?php
$solstice 
strtotime('2017-12-21');
var_dump(date_sunset($solsticeSUNFUNCS_RET_STRING69.245833, -53.537222));
?>

Das oben gezeigte Beispiel erzeugt folgende Ausgabe:

bool(false)

Siehe auch

  • date_sunrise() - Returns time of sunrise for a given day and location
  • date_sun_info() - Returns an array with information about sunset/sunrise and twilight begin/end