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/**
* 根据起点坐标和终点坐标测距离
* @param [array] $from [起点坐标(经纬度),例如:array(118.012951,36.810024)]
* @param [array] $to [终点坐标(经纬度)]
* @param [bool] $km 是否以公里为单位 false:米 true:公里(千米)
* @param [int] $decimal 精度 保留小数位数
* @return [string] 距离数值
*/
function get_distance($from, $to, $km = true, $decimal = 2)
{
sort($from);
sort($to);
$EARTH_RADIUS = 6370.996; // 地球半径系数
$distance = $EARTH_RADIUS * 2 * asin(sqrt(pow(sin(($from[0] * pi() / 180 - $to[0] * pi() / 180) / 2), 2) + cos($from[0] * pi() / 180) * cos($to[0] * pi() / 180) * pow(sin(($from[1] * pi() / 180 - $to[1] * pi() / 180) / 2), 2))) * 1000;
if ($km) {
$distance = $distance / 1000;
}
return round($distance, $decimal);
}Your inbox is getting full, would you like us to enable automatic archiving of old messages?
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