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)
(PHP 5, PHP 7, PHP 8)
date_sunset — 返回给定的日期与地点的日落时间
该函数自 PHP 8.1.0 起弃用。强烈建议不要依赖此函数。请改用 date_sun_info()。
$timestamp
,$returnFormat
= SUNFUNCS_RET_STRING
,$latitude
= null
,$longitude
= null
,$zenith
= null
,$utcOffset
= null
date_sunset() 返回给定的日期(以
timestamp
指定)与地点的日落时间。
timestamp
返回给定的日期(以
timestamp
指定)的日落时间。
returnFormat
常量 | 说明 | 取值举例 |
---|---|---|
SUNFUNCS_RET_STRING | 以 string 格式返回结果 | 16:46 |
SUNFUNCS_RET_DOUBLE | 以 float 格式返回结果 | 16.78243132 |
SUNFUNCS_RET_TIMESTAMP | 以 int 格式(时间戳)返回结果 | 1095034606 |
latitude
默认是指北纬。因此如果要指定南纬,必须传递一个负值。参见:date.default_latitude
longitude
默认是指东经。因此如果要指定西经,必须传递一个负值。参见: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
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. |
utcOffset
单位是小时。
The utcOffset
is ignored, if
returnFormat
is
SUNFUNCS_RET_TIMESTAMP
.
用指定的格式 returnFormat
返回日落时间, 或者在失败时返回 false
。
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.
在每次调用日期/时间函数时,如果时区无效则会引发 E_NOTICE
错误。参见
date_default_timezone_set()。
版本 | 说明 |
---|---|
8.1.0 | 此函数已弃用,请改用 date_sun_info()。 |
8.0.0 |
latitude , longitude ,
zenith and utcOffset are nullable now.
|
示例 #1 date_sunset() 例子
<?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);
?>
以上示例的输出类似于:
Mon Dec 20 2004, sunset time : 18:13
示例 #2 No sunrise
<?php
$solstice = strtotime('2017-12-21');
var_dump(date_sunrise($solstice, SUNFUNCS_RET_STRING, 69.245833, -53.537222));
?>
以上示例会输出:
bool(false)
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)
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
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";
}
?>