PHP Conference Japan 2024

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

Опис

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

Параметри

timestamp

Unix timestamp.

latitude

Latitude in degrees.

longitude

Longitude in degrees.

Значення, що повертаються

Returns an array whose structure 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.

Журнал змін

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

Приклади

Приклад #1 A date_sun_info() example

<?php
$sun_info
= date_sun_info(strtotime("2006-12-12"), 31.7667, 35.2333);
foreach (
$sun_info as $key => $val) {
echo
"$key: " . date("H:i:s", $val) . "\n";
}
?>

Поданий вище приклад виведе:

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

Приклад #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";
}
?>

Поданий вище приклад виведе:

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

Приклад #3 Midnight sun (Tromsø, Norway)

<?php
$si
= date_sun_info(strtotime("2022-06-26"), 69.68, 18.94);
print_r($si);
?>

Поданий вище приклад виведе:

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
)

Приклад #4 Calculating length of day (Kyiv)

<?php
$si
= date_sun_info(strtotime('2022-08-26'), 50.45, 30.52);
$diff = $si['sunset'] - $si['sunrise'];
echo
"Length of day: ",
floor($diff / 3600), "h ",
floor(($diff % 3600) / 60), "s\n";
?>

Поданий вище приклад виведе:

Length of day: 13h 56s

add a note

User Contributed Notes 1 note

up
9
TheFax
2 years ago
In the last example, conversion from seconds to Hour, Minutes, Seconds is wrong.
This is the correct verion:

<?php
$si
= date_sun_info(strtotime('2022-08-26'), 50.45, 30.52);
$diff = $si['sunset'] - $si['sunrise']; # $diff is measured in seconds.
echo "Length of day: ",
floor($diff / 3600), "h",
floor(($diff % 3600) / 60), "m",
floor($diff % 60), "s\n";
?>

Output:
Length of day: 13h53m15s
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