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The date_sun_info function in PHP is used to retrieve information about the sun for a given day. It returns an array containing various information such as sunrise time, sunset time, solar noon, and more.

To use the date_sun_info function, you need to pass three parameters:
1. time - The Unix timestamp representing the day you want to retrieve sun information for.
2. latitude - The latitude of the location for which you want to retrieve sun information.
3. longitude - The longitude of the location for which you want to retrieve sun information.

Here's an example that demonstrates the usage of the date_sun_info function:

php
$timestamp = strtotime('2021-07-01'); // Unix timestamp for July 1, 2021
$latitude = 37.7749; // Latitude of San Francisco, California
$longitude = -122.4194; // Longitude of San Francisco, California

$sunInfo = date_sun_info($timestamp, $latitude, $longitude);

echo "Sunrise: " . date("H:i:s", $sunInfo['sunrise']) . "\n";
echo "Sunset: " . date("H:i:s", $sunInfo['sunset']) . "\n";
echo "Solar Noon: " . date("H:i:s", $sunInfo['transit']) . "\n";


In the above example, we retrieve sun information for July 1, 2021, at the latitude and longitude corresponding to San Francisco, California. We then use the date function to format the sunrise, sunset, and solar noon times into a readable format (hours:minutes:seconds).