php百度地图根据地址、ip获取经纬度，计算驾车距离

function get_lat_and_lng_ByIP($ip)
{
    $content = file_get_contents("https://api.map.baidu.com/location/ip?ak=百度AK&ip=$ip&coor=gcj02");
    $json = json_decode($content,true);

    $lng=$json['content']['point']['x'];//提取经度数据

    $lat=$json['content']['point']['y'];//提取纬度数据

    return array('lat'=>$lat,'lng'=>$lng);
}

function get_lat_and_lng_Byaddress($address,$city)
{
    $content = file_get_contents("https://api.map.baidu.com/geocoding/v3/?address=$address&output=json&ak=百度AK&city=$city&ret_coordtype=gcj02");
    $json = json_decode($content,true);

    $lng=$json['result']['location']['lng'];//提取经度数据

    $lat=$json['result']['location']['lat'];//提取纬度数据

    return array('lat'=>$lat,'lng'=>$lng);
}

if(!empty($_SESSION['lat'])&&!empty($_SESSION['lng'])){
          $lat = $_SESSION['lat'];
          $lng = $_SESSION['lng'];
}elseif(!empty($_SESSION['mydingwei'])){
          $address=$_SESSION['mydingwei'];
          $city=$_SESSION['city_name'];
          $zuobiao=$this->get_lat_and_lng_Byaddress($address,$city);
          $lat = $zuobiao['lat'];
          $lng = $zuobiao['lng'];
}else{
          $user_ip= $_SERVER["REMOTE_ADDR"];//获取客户端IP
          $zuobiao=$this->get_lat_and_lng_ByIP($user_ip);
          $lat = $zuobiao['lat'];
          $lng = $zuobiao['lng'];
}

//计算驾车距离

$distance = m('util')->GetDistance($lat, $lng, $lat2, $lng2, 2);

function GetDistance($lat1, $lng1, $lat2, $lng2, $len_type = 1, $decimal = 2)
{
    $content = file_get_contents("https://api.map.baidu.com/directionlite/v1/driving?origin=$lat1,$lng1&destination=$lat2,$lng2&ak=百度AK&coord_type=gcj02");
    $json = json_decode($content,true);
    $s=$json['result']['routes'][0]['distance'];
    if( 1 < $len_type )
    {
        $s /= 1000;
    }
    return round($s, $decimal);
}