PHP geolocation search and calculate distance

use lbs; 
 
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" 
  } 
)

db.lbs.ensureIndex( 
  { 
    loc: "2dsphere" 
  } 
)

113.323568, 23.146436

db.lbs.find( 
  { 
    loc: { 
      $near:{ 
        $geometry:{ 
          type: "Point", 
          coordinates: [113.323568, 23.146436] 
        }, 
        $maxDistance: 1000 
      } 
    } 
  } 
)

<?php 
// 连接mongodb 
function conn($dbhost, $dbname, $dbuser, $dbpasswd){ 
  $server = &#39;mongodb://&#39;.$dbuser.&#39;:&#39;.$dbpasswd.&#39;@&#39;.$dbhost.&#39;/&#39;.$dbname; 
  try{ 
    $conn = new MongoClient($server); 
    $db = $conn->selectDB($dbname); 
  } catch (MongoException $e){ 
    throw new ErrorException(&#39;Unable to connect to db server. Error:&#39; . $e->getMessage(), 31); 
  } 
  return $db; 
} 
 
// 插入坐标到mongodb 
function add($dbconn, $tablename, $longitude, $latitude, $name){ 
  $index = array(&#39;loc&#39;=>&#39;2dsphere&#39;); 
  $data = array( 
      &#39;loc&#39; => array( 
          &#39;type&#39; => &#39;Point&#39;, 
          &#39;coordinates&#39; => array(doubleval($longitude), doubleval($latitude)) 
      ), 
      &#39;name&#39; => $name 
  ); 
  $coll = $dbconn->selectCollection($tablename); 
  $coll->ensureIndex($index); 
  $result = $coll->insert($data, array(&#39;w&#39; => true)); 
  return (isset($result[&#39;ok&#39;]) && !empty($result[&#39;ok&#39;])) ? true : false; 
} 
 
// 搜寻附近的坐标 
function query($dbconn, $tablename, $longitude, $latitude, $maxdistance, $limit=10){ 
  $param = array( 
    &#39;loc&#39; => array( 
      &#39;$nearSphere&#39; => array( 
        &#39;$geometry&#39; => array( 
          &#39;type&#39; => &#39;Point&#39;, 
          &#39;coordinates&#39; => array(doubleval($longitude), doubleval($latitude)),  
        ), 
        &#39;$maxDistance&#39; => $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(&#39;localhost&#39;,&#39;lbs&#39;,&#39;root&#39;,&#39;123456&#39;); 
 
// 随机插入100条坐标纪录 
for($i=0; $i<100; $i++){ 
  $longitude = &#39;113.3&#39;.mt_rand(10000, 99999); 
  $latitude = &#39;23.15&#39;.mt_rand(1000, 9999); 
  $name = &#39;name&#39;.mt_rand(10000,99999); 
  add($db, &#39;lbs&#39;, $longitude, $latitude, $name); 
} 
 
// 搜寻一公里内的点 
$longitude = 113.323568; 
$latitude = 23.146436; 
$maxdistance = 1; 
$result = query($db, &#39;lbs&#39;, $longitude, $latitude, $maxdistance); 
print_r($result); 
?>

use lbs; 
db.createUser( 
  { 
    "user":"root", 
    "pwd":"123456", 
    "roles":[] 
  } 
) 
 
db.auth( 
  { 
    "user":"root", 
    "pwd":"123456" 
  } 
)

<?php
/**
 * 计算两点地理坐标之间的距离
 * @param Decimal $longitude1 起点经度
 * @param Decimal $latitude1 起点纬度
 * @param Decimal $longitude2 终点经度 
 * @param Decimal $latitude2 终点纬度
 * @param Int   $unit    单位 1:米 2:公里
 * @param Int   $decimal  精度 保留小数位数
 * @return Decimal
 */
function getDistance($longitude1, $latitude1, $longitude2, $latitude2, $unit=2, $decimal=2){

  $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, $latitude1, $longitude2, $latitude2, 1);
echo $distance.&#39;m&#39;; // 2342.38m

$distance = getDistance($longitude1, $latitude1, $longitude2, $latitude2, 2);
echo $distance.&#39;km&#39;; // 2.34km

?>