[php]
#lat1,lon1是第一個點的經緯度
#lat2,lon2是第二個點的經緯度
#unit的話就用"K" (這樣的話傳回值就會是公尺)
function distance($lat1, $lon1, $lat2, $lon2, $unit) {
global $source;
$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") {
$meters = intval($miles * 1.609344 * 1000);
if($meters > 10000){
return intval($meters/1000).msg(‘公里’,’km’);
}else{
return $meters.msg(‘公尺’,’m’);
}
} else if ($unit == "N") {
return ($miles * 0.8684);
} else {
return $miles;
}
}
[/php]
