這篇文章主要介紹了PHP如何根據兩點間的經緯度計算距離,代碼很簡單,但很實用,需要的朋友可以參考下
這是一個不錯的示例,直接貼代碼,首先要知道緯度值、經度值
- /**
- * @desc 根據兩點間的經緯度計算距離
- * @param float $lat 緯度值
- * @param float $lng 經度值
- */
- function getDistance($lat1, $lng1, $lat2, $lng2)
- {
- $earthRadius = 6367000; //approximate radius of earth in meters
- /*
- Convert these degrees to radians
- to work with the formula
- */
- $lat1 = ($lat1 * pi() ) / 180;
- $lng1 = ($lng1 * pi() ) / 180;
- $lat2 = ($lat2 * pi() ) / 180;
- $lng2 = ($lng2 * pi() ) / 180;
- /*
- Using the
- Haversine formula
- http://en.wikipedia.org/wiki/Haversine_formula
- calculate the distance
- */
- $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);
- }
新聞熱點
疑難解答