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date_sun_info()

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<?php
// enter a $time or a $timestamp
// select a $city or enter the $latitude and $longitude

// gets a timestamp from a date
date_default_timezone_set(
     ✓? // string $timezone
);
$timestamp = strtotime(
     // string $time
);

// gets the latitude and longitude of a city
list($latitude, $longitude) = pbx_get_city_lat_lng(
     ✓? // string $city
);

$array = date_sun_info (
    , // int $timestamp
    , // float $latitude
      // float $longitude
);

// shows the times in a readable format
$date_sun_info = array_map(
    function($timestamp) { return date("H:i:s", $timestamp); },
    $array);
?>
Result
$timestamp = 1601559451
$latitude = 48.85
$longitude = 2.35
$array = [
  'sunrise' => 1601531488,
  'sunset' => 1601573308,
  'transit' => 1601552398,
  'civil_twilight_begin' => 1601529608,
  'civil_twilight_end' => 1601575188,
  'nautical_twilight_begin' => 1601527411,
  'nautical_twilight_end' => 1601577385,
  'astronomical_twilight_begin' => 1601525172,
  'astronomical_twilight_end' => 1601579624,
]
$date_sun_info = [
  'sunrise' => '07:51:28',
  'sunset' => '19:28:28',
  'transit' => '13:39:58',
  'civil_twilight_begin' => '07:20:08',
  'civil_twilight_end' => '19:59:48',
  'nautical_twilight_begin' => '06:43:31',
  'nautical_twilight_end' => '20:36:25',
  'astronomical_twilight_begin' => '06:06:12',
  'astronomical_twilight_end' => '21:13:44',
]
Examples
#1 date_sun_info  (/* $timezone = "Europe/Paris" */
 /* $time = "now" */
 /* $city = "Paris" */
 $timestamp,
 $latitude,
 $longitude)
#2 date_sun_info  (/* $timezone = "UTC" */
 /* $time = "2006-12-12" */
 $timestamp,
 31.7667,
 35.2333)
#3 date_sun_info  (/* $timezone = "UTC" */
 962409600,
 50,
 50)
See also
array_map, date, date_default_timezone_set, date_sunrise, date_sunset, pbx_get_city_lat_lng, strtotime
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