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date_sun_info

(PHP 5 >= 5.1.2, PHP 7, PHP 8)

date_sun_infoReturns an array with information about sunset/sunrise and twilight begin/end

说明

date_sun_info(int $timestamp, float $latitude, float $longitude): array

参数

timestamp

Unix timestamp.

latitude

Latitude in degrees.

longitude

Longitude in degrees.

返回值

Returns array on success 或者在失败时返回 false. The structure of the array is detailed in the following list:

sunrise
The timestamp of the sunrise (zenith angle = 90°35').
sunset
The timestamp of the sunset (zenith angle = 90°35').
transit
The timestamp when the sun is at its zenith, i.e. has reached its topmost point.
civil_twilight_begin
The start of the civil dawn (zenith angle = 96°). It ends at sunrise.
civil_twilight_end
The end of the civil dusk (zenith angle = 96°). It starts at sunset.
nautical_twilight_begin
The start of the nautical dawn (zenith angle = 102°). It ends at civil_twilight_begin.
nautical_twilight_end
The end of the nautical dusk (zenith angle = 102°). It starts at civil_twilight_end.
astronomical_twilight_begin
The start of the astronomical dawn (zenith angle = 108°). It ends at nautical_twilight_begin.
astronomical_twilight_end
The end of the astronomical dusk (zenith angle = 108°). It starts at nautical_twilight_end.

The values of the array elements are either UNIX timestamps, false if the sun is below the respective zenith for the whole day, or true if the sun is above the respective zenith for the whole day.

更新日志

版本 说明
7.2.0 The calculation was fixed with regards to local midnight instead of local noon, which changes the results slightly.

范例

示例 #1 A date_sun_info() example

<?php
$sun_info 
date_sun_info(strtotime("2006-12-12"), 31.766735.2333);
foreach (
$sun_info as $key => $val) {
    echo 
"$key: " date("H:i:s"$val) . "\n";
}
?>

以上例程会输出:

sunrise: 05:52:11
sunset: 15:41:21
transit: 10:46:46
civil_twilight_begin: 05:24:08
civil_twilight_end: 16:09:24
nautical_twilight_begin: 04:52:25
nautical_twilight_end: 16:41:06
astronomical_twilight_begin: 04:21:32
astronomical_twilight_end: 17:12:00

示例 #2 Polar night, with some processing

<?php
$tz 
= new \DateTimeZone('America/Anchorage');

$si date_sun_info(strtotime("2022-12-21"), 70.21, -148.51);
foreach (
$si as $key => $value) {
    echo
        
match ($value) {
            
true => 'always',
            
false => 'never',
            default => 
date_create("@{$value}")->setTimeZone($tz)->format'H:i:s T' ),
        },
        
": {$key}",
        
"\n";
}
?>

以上例程会输出:

never: sunrise
never: sunset
12:52:18 AKST: transit
10:53:19 AKST: civil_twilight_begin
14:51:17 AKST: civil_twilight_end
09:01:47 AKST: nautical_twilight_begin
16:42:48 AKST: nautical_twilight_end
07:40:47 AKST: astronomical_twilight_begin
18:03:49 AKST: astronomical_twilight_end

示例 #3 Midnight sun (Tromsø, Norway)

<?php
$si 
date_sun_info(strtotime("2022-06-26"), 69.6818.94);
print_r($si);
?>

以上例程会输出:

Array
(
    [sunrise] => 1
    [sunset] => 1
    [transit] => 1656240426
    [civil_twilight_begin] => 1
    [civil_twilight_end] => 1
    [nautical_twilight_begin] => 1
    [nautical_twilight_end] => 1
    [astronomical_twilight_begin] => 1
    [astronomical_twilight_end] => 1
)

示例 #4 Calculating length of day (Kyiv)

<?php
$si 
date_sun_info(strtotime('2022-08-26'), 50.4530.52);
$diff $si['sunset'] - $si['sunrise'];
echo 
"Length of day: ",
    
floor($diff 3600), "h ",
    
floor(($diff 3600) / 60), "s\n";
?>

以上例程会输出:

Length of day: 13h 56s

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