查找附近的坐标

圆形内的坐标（圆心与半径组成的圆形范围，返回距圆心距离）

$juli = getDistance($loc1[1], $loc1[0], $loc2[1], $loc2[0]);
$pipeline[] = ['$geoNear' => [
    'near'=>$loc1, // 当前坐标
    'spherical'=>true, // 计算球面距离
    'distanceMultiplier'=>6378137, // 地球半径,单位是米,那么的除的记录也是米
    'maxDistance'=>($juli+1)/6378137, // 过滤条件200000米内，需要弧度
    'distanceField'=>'distance'
]];
$pipeline[] = ['$project' => ['_id' => 1, 'uid' => 1, 'loc' => 1, 'state' => 1, 'close' => 1, 'hezuo_type' => 1, 'distance' => 1]];
$pipeline[] = ['$match' => ['state' => ['$in' => [1, -2, 0]]]];
$pipeline[] = ['$limit' => 3];

$result = $db->aggregate(COLLECTION_USERCOMPANY_SET, $pipeline);
echo json_encode($result);

圆形内的坐标（圆心与半径组成的圆形范围，不返回距圆）

$loc1 = [112.53362699029492, 33.01046814237027]; // 我的位置
$loc2 = [112.53385881284048,33.001754496370701]; // 最远的位置
$maxDistance = sqrt(pow($loc2[0] -$loc1[0], 2) + pow($loc2[1] -$loc1[1], 2));
echo $maxDistance;
$filter_store['loc'] = ['$near' => $loc1, '$maxDistance' => $maxDistance];
$projection = ['_id' => 1, 'uid' => 1, 'loc' => 1, 'state' => 1, 'close' => 1, 'hezuo_type' => 1];
$result = $db->find(COLLECTION_USERCOMPANY_SET, $filter_store, [], $projection);
echo json_encode($result);

计算距离

function getDistance($lat1, $lng1, $lat2, $lng2)
{
    // define('PI',3.1415926535898);
    $pi = 3.1415926535898;
    //define('EARTH_RADIUS',6378.137);
    $earth = 6378.137;
    $radLat1 = $lat1 * ($pi / 180);
    $radLat2 = $lat2 * ($pi / 180);

    $a = $radLat1 - $radLat2;
    $b = ($lng1 * ($pi / 180)) - ($lng2 * ($pi / 180));

    $s = 2 * asin(sqrt(pow(sin($a / 2), 2) + cos($radLat1) * cos($radLat2) * pow(sin($b / 2), 2)));
    $s = $s * $earth;
    $s = round($s * 10000) / 10000;
    return $s * 1000;
}

 矩形平面内的坐标（左下角位置与右上角位置组成的矩形范围）

$filter['loc'] = ['$within' => ['$box' => [$lb_loc, $rt_loc]]];
$filter['$or'] = [['state' => 1], ['state' => -2]]; // 正常营业与停业中
if (trim($data['search']) !== "") {
    $filter["company_name"] = array('$regex' => $data["search"]);
}
$projection = ['_id' => 1, 'uid' => 1, 'company_name' => 1, 'company_logo' => 1, 'loc' => 1, 'company_address' => 1,
    'ctype' => 1, 'top_id' => 1, 'state' => 1, 'close' => 1, 'hezuo_type' => 1];
$results = $db->queryPage(COLLECTION_USERCOMPANY_SET, $filter, array("_id" => -1), $data["page"], $data["pagenum"], $projection);

备注：

1、https://github.com/mongodb/mongo-php-driver

2、创建2d索引

$db->createIndex(COLLECTION_USERCOMPANY_SET, ['loc' => '2d'], ['min' => -180 , 'max' => 180, 'bits' => 26 ]);

 3、参考：https://blog.csdn.net/zxjiayou1314/article/details/50844489

4、$filter_store['loc'] = ['$within' => ['$box' => [$lb_loc, $rt_loc]]];在旋转地图的情况下，返回的结果不准确。