date_sun_info

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

date_sun_info — Returns an array with information about sunset/sunrise and twilight begin/end

Descrizione

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

Elenco dei parametri

timestamp: Unix timestamp.
latitude: Latitude in degrees.
longitude: Longitude in degrees.

Valori restituiti

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.

Log delle modifiche

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

Esempi

Example #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";
}
?>

Il precedente esempio visualizzerà:

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

Example #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";
}
?>

Il precedente esempio visualizzerà:

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

Example #3 Midnight sun (Tromsø, Norway)

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

Il precedente esempio visualizzerà:

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
)

Example #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";
?>

Il precedente esempio visualizzerà:

Length of day: 13h 56s

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User Contributed Notes 1 note

down

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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