Sunrise and sunset at given coordinates (PHP)

suncalc.php

#!/usr/bin/php
<?php
$lat = 47.85;
$lon = 12.55;
if (isset($argv[1])) {
        $sun = $argv[1];
} else {
        $sun = "";
}
switch ($sun) {
    case "sunrise":
        echo date_sunrise(time(), SUNFUNCS_RET_STRING, $lat, $lon, 90, 0);
        echo "\n";
        break;
    case "sunset":
        echo date_sunset(time(), SUNFUNCS_RET_STRING, $lat, $lon, 90, 0);
        echo "\n";
        break;
    default:
        echo $argv[0]." (sunrise|sunset)";
        echo "\n";
        echo "Output time in UTC";
        echo "\n";
}
?>