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php计算两个坐标（经度，纬度）之间的距离，返回结果为米或者千米
- function distance($lat1, $lng1, $lat2, $lng2, $miles = true)
- {
- $pi80 = M_PI / 180;
- $lat1 *= $pi80;
- $lng1 *= $pi80;
- $lat2 *= $pi80;
- $lng2 *= $pi80;
-
- $r = 6372.797; // mean radius of Earth in km
- $dlat = $lat2 - $lat1;
- $dlng = $lng2 - $lng1;
- $a = sin($dlat / 2) * sin($dlat / 2) + cos($lat1) * cos($lat2) * sin($dlng / 2) * sin($dlng / 2);
- $c = 2 * atan2(sqrt($a), sqrt(1 - $a));
- $km = $r * $c;
-
- return ($miles ? ($km * 0.621371192) : $km);
- }
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