我的問題是我將如何捨棄下面的腳本的輸出來顯示107.4而不是107.44613075316我發現了PHP函數,但我不知道如何實現它。舍入數
///// Get the two locations from the url
$lat1 = $_GET[lat1];
$lon1 = $_GET[lon1];
$lat2 = $_GET[lat2];
$lon2 = $_GET[lon2];
//////calculate the distance
function distance($lat1, $lon1, $lat2, $lon2, $unit) {
$theta = $lon1 - $lon2;
$dist = sin(deg2rad($lat1)) * sin(deg2rad($lat2)) +
cos(deg2rad($lat1)) * cos(deg2rad($lat2)) * cos(deg2rad($theta));
$dist = acos($dist);
$dist = rad2deg($dist);
$miles = $dist * 60 * 1.1515;
$unit = strtoupper($unit);
if ($unit == "K") {
return ($miles * 1.609344);
} else if ($unit == "N") {
return ($miles * 0.8684);
} else {
return $miles;
}
}
// Miles
echo distance($lat1, $lon1, $lat2, $lon2, "m") . " miles<br><br>";
//Kilometers
echo distance($lat1, $lon1, $lat2, $lon2, "k") . " kilometers<br><br>";
//Nautical miles
echo distance($lat1, $lon1, $lat2, $lon2, "N") . " Nautical miles";
請閱讀手冊:http://php.net/round,甚至有給定的例子。 – hakre 2012-03-09 00:21:58