PHP - Get the sunrise/sunset time with accuracy

sunrise_sunset.php

<?php

/* 
* Calculate the sunrise/sunset  time for Gothenburg, Sweden
*
* Latitude: 57.696991
* Longitude: 11.986500)
*/

$date_sun_info = date_sun_info(strtotime("2019-09-03"), 57.696991, 11.986500);
$sun_info = array(
  'sunrise' => sunrise_sunset_gmt($date_sun_info['sunrise']), 
  'sunset' => sunrise_sunset_gmt($date_sun_info['sunset']), 
);

function sunrise_sunset_gmt($sun_type)
{
  // snap to UTC.
  $date = new DateTime("@".$sun_type); 

  // Retrieve GMT, Timezone through country.
  $date->setTimezone(new DateTimeZone('Europe/Stockholm'));

  // Sweden format.
  return $date->format('H:i'); 
}


// Just for show.
// (php index.php) in cmd
echo "___________";
echo PHP_EOL;
echo " Sunrise: " . $sun_info['sunrise'] . PHP_EOL;
echo " Sunset: "  . $sun_info['sunset']  . PHP_EOL;
echo "___________";