date_sunset

(PHP 5, PHP 7)

date_sunset — Returns time of sunset for a given day and location

Opis

date_sunset ( int $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.

Parametry

timestamp

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

format

**`format` 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 integer (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.

gmtoffset

Specified in hours. The gmtoffset is ignored, if format is SUNFUNCS_RET_TIMESTAMP.

Błędy/Wyjątki

Każde wywołanie do funkcji date/time spowoduje wygenerowanie E_NOTICE jeśli strefa czasowa jest nieprawidłowa, lub/i wiadomość E_STRICT jeśli użyto ustawień systemu lub zmiennej środowiskowej TZ. Patrz także date_default_timezone_set()

Rejestr zmian

Wersja	Opis
5.1.0	Teraz generuje błędy strefy czasowej o poziomie `E_STRICT` i `E_NOTICE`.

Zwracane wartości

Returns the sunset time in a specified format on success lub FALSE w przypadku niepowodzenia. 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.

Przykłady

Przykład #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);

?>

Powyższy przykład wyświetli coś podobnego do:

Mon Dec 20 2004, sunset time : 18:13

Przykład #2 No sunset


<?php
$solstice = strtotime('2017-12-21');
var_dump(date_sunset($solstice, SUNFUNCS_RET_STRING, 69.245833, -53.537222));
?>

Powyższy przykład wyświetli:

bool(false)

Zobacz też:

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

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User Contributed Notes 3 notes

down

matt at mctsoft dot net ¶

4 years ago


yes SUNFUNCS_RET_TIMESTAMP does return GMT(0) time

so something like...

$arr = localtime(date_sunset(time(),SUNFUNCS_RET_TIMESTAMP,51.5,0)); // London

$hh = $arr[2];
$mm = $arr[1];

Will give figure out your localtime and daylight saving (BST)

down

-1

nospam at nomail dot com ¶

6 years ago


maybe I am wrong, but I think

SUNFUNCS_RET_TIMESTAMP     return GMT(0) time

SUNFUNCS_RET_STRING     Return local time
SUNFUNCS_RET_DOUBLE     Return local time

down

-25

michael at dayah dot com ¶

17 years ago


I use an IP to location database to determine the visitor's approximate latitude and longitude and then serve them a day or night color scheme based on whether it is before civil dawn or dusk. I've had problems when not specifying the timezone, specifically a 1 hour error, so I use GMT.



<?php

date_default_timezone_set("GMT");



function scheme() {

        $sunrise = date_sunrise(time(), SUNFUNCS_RET_DOUBLE, $latitude, $longitude, 96, 0);

        $sunset = date_sunset(time(), SUNFUNCS_RET_DOUBLE, $latitude, $longitude, 96, 0);

        $now = date("H") + date("i") / 60 + date("s") / 3600;



        if ($sunrise < $sunset)

                if (($now > $sunrise) && ($now < $sunset)) return "day";

                else return "night";

        else

                if (($now > $sunrise) || ($now < $sunset)) return "day";

                else return "night";

}

?>

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