PHP | date_sun_info() Function

The date_sun_info() is an inbuilt function in PHP which is used to find the information about sunset/sunrise and twilight begin/end for a specified day and location.
Syntax:

array date_sun_info($timestamp, $latitude, $longitude)

Parameters: This function accepts three parameters as mentioned above and described below: 

• $timestamp: It is a mandatory parameter which specifies the timestamp of the day from which the sunrise time is taken.
• $latitude: It is an mandatory parameter which specifies the latitude of the location. By default, it set as North. To specify a value for South, pass in a negative value.
• $longitude: It is an mandatory parameter which specifies the longitude of the location. By defaults, it set as East. To modify a value for West, pass in a negative value.

Return Value: It returns an array containing information about sunset/sunrise and twilight begin/end, for a specified day and location and returns False on failure.
Exceptions: In PHP versions 5.2.2 the order of parameters $latitude and $longitude has been swapped.
Below programs illustrate the date_sun_info() function.
Program 1:

php

<?php

// PHP program to print information
// about sunset/sunrise and twilight
// begin/end for specified location
// New Delhi India

/* ********New Delhi********
Latitude = 28.6139° N
Longitude = 77.2090° E
*/

$arr =  date_sun_info(strtotime("June-26-2018"),
                             28.61, 77.2090 );
foreach ($arr as $key => $val) {
    echo "$key: " . date("H:i:s", $val) . "\n";
}

?>

Output:

sunrise: 23:55:58
sunset: 13:53:02
transit: 06:54:30
civil_twilight_begin: 23:29:08
civil_twilight_end: 14:19:52
nautical_twilight_begin: 22:56:35
nautical_twilight_end: 14:52:25
astronomical_twilight_begin: 22:21:59
astronomical_twilight_end: 15:27:01

Program 2:

php

<?php

// PHP program to print information
// about sunset/sunrise and twilight
// begin/end for specified location
// USA Washington, D.C.

// Latitude = 38.9072° N
// Longitude = 77.0369° W


$arr =  date_sun_info(strtotime("June-26-2018"),
                             38.9072, 77.0369 );
foreach ($arr as $key => $val) {
    echo "$key: " . date("H:i:s", $val) . "\n";
}

?>

Output:

sunrise: 23:28:58
sunset: 14:21:24
transit: 06:55:11
civil_twilight_begin: 22:57:03
civil_twilight_end: 14:53:20
nautical_twilight_begin: 22:16:45
nautical_twilight_end: 15:33:38
astronomical_twilight_begin: 21:30:31
astronomical_twilight_end: 16:19:51

Reference: http://php.net/manual/en/function.date-sun-info.php