(PHP 5, PHP 7)
date_sunset — Returns time of sunset for a given day and location
$timestamp
[, int $format = 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 $gmt_offset = 0
]]]]] ) : mixed
date_sunset() returns the sunset time for a given
day (specified as a timestamp) and location.
timestamp
The timestamp of the day from which the sunset
time is taken.
format
| 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 integer (timestamp) | 1095034606 |
latitudeDefaults to North, pass in a negative value for South. See also: date.default_latitude
longitudeDefaults 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
| 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. |
gmtoffset
Specified in hours.
The gmtoffset is ignored, if
format is
SUNFUNCS_RET_TIMESTAMP.
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()
| Version | Beschreibung |
|---|---|
| 5.1.0 |
Erzeugt nun |
Returns the sunset time in a specified format 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.
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_STRING, 38.4, -9, 90, 1);
?>
Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:
Mon Dec 20 2004, sunset time : 18:13
Beispiel #2 No sunset
<?php
$solstice = strtotime('2017-12-21');
var_dump(date_sunset($solstice, SUNFUNCS_RET_STRING, 69.245833, -53.537222));
?>
Das oben gezeigte Beispiel erzeugt folgende Ausgabe:
bool(false)