PHP实现搜索地理位置及计算两点地理位置间距离的实例

db.lbs.insert(
{
loc:{
type: "Point",coordinates: [113.332264,23.156206]
},name: "广州东站"
}
)

db.lbs.insert(
{
loc:{
type: "Point",coordinates: [113.330611,23.147234]
},name: "林和西"
}
)

db.lbs.insert(
{
loc:{
type: "Point",coordinates: [113.328095,23.165376]
},name: "天平架"
}
)

selectDB($dbname); } catch (MongoException $e){ throw new ErrorException('Unable to connect to db server. Error:' . $e->getMessage(),31); } return $db; }

// 插入坐标到mongodb
function add($dbconn,$tablename,$longitude,$latitude,$name){
$index = array('loc'=>'2dsphere');
$data = array(
'loc' => array(
'type' => 'Point','coordinates' => array(doubleval($longitude),doubleval($latitude))
),'name' => $name
);
$coll = $dbconn->selectCollection($tablename);
$coll->ensureIndex($index);
$result = $coll->insert($data,array('w' => true));
return (isset($result['ok']) && !empty($result['ok'])) ? true : false;
}

// 搜寻附近的坐标
function query($dbconn,$maxdistance,$limit=10){
$param = array(
'loc' => array(
'$nearSphere' => array(
'$geometry' => array(
'type' => 'Point',doubleval($latitude)),),'$maxDistance' => $maxdistance*1000
)
)
);

$coll = $dbconn->selectCollection($tablename);
$cursor = $coll->find($param);
$cursor = $cursor->limit($limit);

$result = array();
foreach($cursor as $v){
$result[] = $v;
}

return $result;
}

$db = conn('localhost','lbs','root','123456');

// 随机插入100条坐标纪录
for($i=0; $i<100; $i++){
$longitude = '113.3'.mt_rand(10000,99999);
$latitude = '23.15'.mt_rand(1000,9999);
$name = 'name'.mt_rand(10000,99999);
add($db,$name);
}

// 搜寻一公里内的点
$longitude = 113.323568;
$latitude = 23.146436;
$maxdistance = 1;
$result = query($db,$maxdistance);
print_r($result);
?>

db.auth(
{
"user":"root","pwd":"123456"
}
)

$EARTH_RADIUS = 6370.996; // 地球半径系数
$PI = 3.1415926;

$radLat1 = $latitude1 $PI / 180.0;
$radLat2 = $latitude2 $PI / 180.0;

$radLng1 = $longitude1 $PI / 180.0;
$radLng2 = $longitude2 $PI /180.0;

$a = $radLat1 - $radLat2;
$b = $radLng1 - $radLng2;

$distance = 2 asin(sqrt(pow(sin($a/2),2) + cos($radLat1) cos($radLat2) pow(sin($b/2),2)));
$distance = $distance $EARTH_RADIUS * 1000;

if($unit==2){
$distance = $distance / 1000;
}

return round($distance,$decimal);

}

// 起点坐标
$longitude1 = 113.330405;
$latitude1 = 23.147255;

// 终点坐标
$longitude2 = 113.314271;
$latitude2 = 23.1323;

$distance = getDistance($longitude1,1);
echo $distance.'m'; // 2342.38m

$distance = getDistance($longitude1,2);
echo $distance.'km'; // 2.34km

?>