PHP根据经纬度获取两个地点之间的直线距离

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/**  * 根据两点间的经纬度计算距离  * @param $lat1 纬度1  * @param $lng1 经度1  * @param $lat2 纬度2  * @param $lng2 经度2  * @return array  */ function get_distance($lat1, $lng1, $lat2, $lng2): array {     //赤道半径(单位m)     $earthRadius = 6378137;     $lat1        = ($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)));     //米     $calculatedDistance = abs(round(($earthRadius * $stepTwo), 2));     //千米     $calculatedDistanceKm = abs(round(($calculatedDistance / 1000), 2));     if ($calculatedDistanceKm >= 1) {         if ($calculatedDistanceKm > 999) {             $distance_str = ">999 km";         } else {             $distance_str = $calculatedDistanceKm . " km";         }     } else {         $distance_str = $calculatedDistance . " m";     }     return [         'distance'     => $calculatedDistance,         'distance_str' => $distance_str,     ]; }