date_sunrise

(PHP 5, PHP 7)

date_sunrise — Returns time of sunrise for a given day and location

Opis

date_sunrise ( 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.sunrise_zenith") [, float $gmt_offset = 0 ]]]]] ) : mixed

date_sunrise() returns the sunrise time for a given day (specified as a timestamp) and location.

Parametry

timestamp

The timestamp of the day from which the sunrise 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.sunrise_zenith

**Common `zenith` angles**
Angle	Description
90°50'	Sunrise: the point where the sun becomes visible.
96°	Civil twilight: conventionally used to signify the start of dawn.
102°	Nautical twilight: the point at which the horizon starts being visible at sea.
108°	Astronomical twilight: the point at which the sun starts being the source of any illumination.

gmtoffset

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

Zwracane wartości

Returns the sunrise time in a specified format on success lub FALSE w przypadku niepowodzenia. One potential reason for failure is that the sun does not rise at all, which happens inside the polar circles for part of the year.

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`.

Przykłady

Przykład #1 date_sunrise() example


<?php

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

echo date("D M d Y"). ', sunrise time : ' .date_sunrise(time(), SUNFUNCS_RET_STRING, 38.4, -9, 90, 1);

?>

Powyższy przykład wyświetli coś podobnego do:

Mon Dec 20 2004, sunrise time : 08:54

Przykład #2 No sunrise


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

Powyższy przykład wyświetli:

bool(false)

Zobacz też:

date_sunset() - Returns time of sunset 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

nomail at nospam 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

scottix at gmail dot com ¶

10 years ago


If you are working in multiple timezones getting the offset from a date is a little tricky because you need it in hours.

<?php

$time = new DateTime('now', new DateTimeZone('America/Los_Angeles'));

date_sunrise(
 $time->getTimestamp(),
 SUNFUNCS_RET_TIMESTAMP,
 38.4,
 -9,
 90,
 $time->getOffset() / 3600
);

down

-6

jonathanNO dot kuhnSPAM at gmailNOSPAM dot com ¶

14 years ago


After some searching, I finally found a website that can calculate the sun's zenith. Just look up your city's lat/long (remember, west/south are negative even if it doesn't show where you look up the lat/long) and the time of sunrise/sunset and use this site:

http://solardat.uoregon.edu/cgi-bin/SolarPositionCalculator.cgi

You have to enter in the sunrise/sunset times separately, but it works.
San Diego is:
 Lat: 32.73
 Long: -117.17
 Sunrise Z.: 90.7379
 Sunset Z.: 90.8880

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