PHP根據兩個經緯度座標計算距離

function rad($d) { return $d * 3.1415926535898 / 180.0; } function GetDistance($lat1, $lng1, $lat2, $lng2) { $EARTH_RADIUS = 6378.137; $radLat1 = rad($lat1); //echo $radLat1; $radLat2 = rad($lat2); $a = $radLat1 - $radLat2; $b = rad($lng1) - rad($lng2); $s = 2 * asin(sqrt(pow(sin($a/2),2) + cos($radLat1)*cos($radLat2)*pow(sin($b/2),2))); $s = $s *$EARTH_RADIUS; $s = round($s * 10000) / 10000; return $s; }