MongoDB\Driver\Server::getInfo

array(23) {
  ["helloOk"]=>
  bool(true)
  ["topologyVersion"]=>
  array(2) {
    ["processId"]=>
    object(MongoDB\BSON\ObjectId)#4 (1) {
      ["oid"]=>
      string(24) "617b6d696a3a89d2f77e6df0"
    }
    ["counter"]=>
    int(6)
  }
  ["hosts"]=>
  array(1) {
    [0]=>
    string(15) "localhost:27017"
  }
  ["setName"]=>
  string(3) "rs0"
  ["setVersion"]=>
  int(1)
  ["ismaster"]=>
  bool(true)
  ["secondary"]=>
  bool(false)
  ["primary"]=>
  string(15) "localhost:27017"
  ["me"]=>
  string(15) "localhost:27017"
  ["electionId"]=>
  object(MongoDB\BSON\ObjectId)#5 (1) {
    ["oid"]=>
    string(24) "7fffffff0000000000000001"
  }
  ["lastWrite"]=>
  array(4) {
    ["opTime"]=>
    array(2) {
      ["ts"]=>
      object(MongoDB\BSON\Timestamp)#6 (2) {
        ["increment"]=>
        string(1) "1"
        ["timestamp"]=>
        string(10) "1635478989"
      }
      ["t"]=>
      int(1)
    }
    ["lastWriteDate"]=>
    object(MongoDB\BSON\UTCDateTime)#7 (1) {
      ["milliseconds"]=>
      string(13) "1635478989000"
    }
    ["majorityOpTime"]=>
    array(2) {
      ["ts"]=>
      object(MongoDB\BSON\Timestamp)#8 (2) {
        ["increment"]=>
        string(1) "1"
        ["timestamp"]=>
        string(10) "1635478989"
      }
      ["t"]=>
      int(1)
    }
    ["majorityWriteDate"]=>
    object(MongoDB\BSON\UTCDateTime)#9 (1) {
      ["milliseconds"]=>
      string(13) "1635478989000"
    }
  }
  ["maxBsonObjectSize"]=>
  int(16777216)
  ["maxMessageSizeBytes"]=>
  int(48000000)
  ["maxWriteBatchSize"]=>
  int(100000)
  ["localTime"]=>
  object(MongoDB\BSON\UTCDateTime)#10 (1) {
    ["milliseconds"]=>
    string(13) "1635478992136"
  }
  ["logicalSessionTimeoutMinutes"]=>
  int(30)
  ["connectionId"]=>
  int(3)
  ["minWireVersion"]=>
  int(0)
  ["maxWireVersion"]=>
  int(13)
  ["readOnly"]=>
  bool(false)
  ["ok"]=>
  float(1)
  ["$clusterTime"]=>
  array(2) {
    ["clusterTime"]=>
    object(MongoDB\BSON\Timestamp)#11 (2) {
      ["increment"]=>
      string(1) "1"
      ["timestamp"]=>
      string(10) "1635478989"
    }
    ["signature"]=>
    array(2) {
      ["hash"]=>
      object(MongoDB\BSON\Binary)#12 (2) {
        ["data"]=>
        string(20) ""
        ["type"]=>
        int(0)
      }
      ["keyId"]=>
      int(0)
    }
  }
  ["operationTime"]=>
  object(MongoDB\BSON\Timestamp)#13 (2) {
    ["increment"]=>
    string(1) "1"
    ["timestamp"]=>
    string(10) "1635478989"
  }
}