|
|
date_sunset (PHP 5) date_sunset --
Returns time of sunset for a given day and location
Описаниеmixed date_sunset ( int timestamp [, int format [, float latitude [, float longitude [, float zenith [, float gmt_offset]]]]] )
date_sunset() returns the sunset time for a given
day (specified as a timestamp) and location.
Список параметров
timestamp
The timestamp of the day from which the sunset
time is taken.
format
Таблица 1. 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
Default: date.sunrise_zenith
gmtoffset
Specified in hours.
Errors/Exceptions
Every call to a date/time function will generate a E_NOTICE
if the time zone is not valid, and/or a E_STRICT message
if using the system settings or the TZ environment
variable. See also date_default_timezone_set() Возвращаемые значения
Returns the sunset time in a specified format on
success, or FALSE on failure.
Примеры
Пример 1. date_sunset() example |
<?php
echo date("D M d Y"). ', sunset time : ' .date_sunset(time(), SUNFUNCS_RET_STRING, 38.4, -9, 90, 1);
?>
|
Результатом выполнения данного примера
будет что-то подобное: Mon Dec 20 2004, sunset time : 18:13 |
|
michael at dayah dot com
30-Sep-2006 05:17
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.
<?
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";
}
?>
jbr (AT) ya-right.com
19-Feb-2005 10:19
Here a function that will return an array of all valid formats, both starting and ending times!
[Editor's note: you can find that function on the docpage of date_sunrise()]
djwice at [the same] dot com
02-Dec-2004 01:39
A way to use this:
<?php
$lat = 52.10; $long = 5.18; $offset = 1; $zenith=90+50/60;
echo "<br><p>Sunrise: ".date_sunrise(time(), SUNFUNCS_RET_STRING, $lat, $long, $zenith, $offset);
echo "<br>Sunset: ".date_sunset(time(), SUNFUNCS_RET_STRING, $lat, $long, $zenith, $offset);
$zenith=96;
echo "<br><p>\"Civilian Twilight\" start: ".date_sunrise(time(), SUNFUNCS_RET_STRING, $lat, $long, $zenith, $offset);
echo "<br>\"Civilian Twilight\" end: ".date_sunset(time(), SUNFUNCS_RET_STRING, $lat, $long, $zenith, $offset);
$zenith=102;
echo "<br><p>\"Nautical Twilight\" start: ".date_sunrise(time(), SUNFUNCS_RET_STRING, $lat, $long, $zenith, $offset);
echo "<br>\"Nautical Twilight\" end: ".date_sunset(time(), SUNFUNCS_RET_STRING, $lat, $long, $zenith, $offset);
$zenith=108;
echo "<br><p>\"Astronomical Twilight\" start: ".date_sunrise(time(), SUNFUNCS_RET_STRING, $lat, $long, $zenith, $offset);
echo "<br>\"Astronomical Twilight\" end: ".date_sunset(time(), SUNFUNCS_RET_STRING, $lat, $long, $zenith, $offset);
?>
Thanks to George King.
More sources about this topic:
http://www.qarlos.free.fr/navegacion/Sextante/formulas.htm
http://williams.best.vwh.net/sunrise_sunset_algorithm.htm
http://www.kevinboone.com/suntimes.html
http://star-www.st-and.ac.uk/~fv/webnotes/chapt12.htm
|
date_sunrise
