//兩點間距離比較近function getDistance($lat1, $lng1, $lat2, $lng2) {  $earthRadius = 6367000; //地球半徑m $lat1 = ($lat1 * pi() ) / 180;  $lng1 = ($lng1 * pi() ) / 180;  $lat2 = ($lat2 * pi() ) / 180;  $lng2 = ($lng2 * pi() ) / 180;  $calcLongitude = $lng2 - $lng1;  $calcLatitude = $lat2 - $lat1;  $stepOne = pow(sin($calcLatitude / 2), 2) + cos($lat1) * cos($lat2) * pow(sin($calcLongitude / 2), 2);  $stepTwo = 2 * asin(min(1, sqrt($stepOne)));  $calculatedDistance = $earthRadius * $stepTwo;  return round($calculatedDistance); } //兩點間距離比較遠function getLongDistance($lat1, $lng1, $lat2,$lng2,$radius = 6378.137){ $rad = floatval(M_PI / 180.0); $lat1 = floatval($lat1) * $rad; $lng1 = floatval($lng1) * $rad; $lat2 = floatval($lat2) * $rad; $lng2 = floatval($lng2) * $rad; $theta = $lng2 - $lng1; $dist = acos(sin($lat1) * sin($lat2) + cos($lat1) * cos($lat2) * cos($theta)); if ($dist < 0 ) {  $dist += M_PI; } return $dist = $dist * $radius;}

 <?php  define('EARTH_RADIUS', 6378.137);//地球半徑  define('PI', 3.1415926);  /**  * 計算兩組經緯度坐標 之間的距離  * params ：lat1 緯度1； lng1 經度1； lat2 緯度2； lng2 經度2； len_type （1:m or 2:km);  * return m or km  */  function GetDistance($lat1, $lng1, $lat2, $lng2, $len_type = 1, $decimal = 2)  {  $radLat1 = $lat1 * PI / 180.0;  $radLat2 = $lat2 * PI / 180.0;  $a = $radLat1 - $radLat2;  $b = ($lng1 * PI / 180.0) - ($lng2 * PI / 180.0);  $s = 2 * asin(sqrt(pow(sin($a/2),2) + cos($radLat1) * cos($radLat2) * pow(sin($b/2),2)));  $s = $s * EARTH_RADIUS;  $s = round($s * 1000);  if ($len_type > 1)  {  $s /= 1000;  }  return round($s, $decimal);  }  echo GetDistance(39.908156,116.4767, 39.908452,116.450479, 1);//輸出距離/米