php如何计算出两个经纬度之间的距离?(单位:米)
/*
* 计算出两个经纬度之间的距离(单位:米)
* */
public function getdistanceAction()
{
$lng1=117.27; //经度1
$lat1=31.86; //纬度1
$lng2=120.19; //经度2
$lat2=30.26; //纬度2
$EARTH_RADIUS = 6378137; //地球半径
$RAD = pi() / 180.0;
$radLat1 = $lat1 * $RAD;
$radLat2 = $lat2 * $RAD;
$a = $radLat1 - $radLat2; // 两点纬度差
$b = ($lng1 - $lng2) * $RAD; // 两点经度差
$s = 2 * asin(sqrt(pow(sin($a / 2), 2) + cos($radLat1) * cos($radLat2) * pow(sin($b / 2), 2)));
$s = $s * $EARTH_RADIUS;
$s = round($s * 10000) / 10000;
print_r($s); //正确答案:330518.674
}