# MongoDB\Driver\Server::getLatency

(mongodb >=1.0.0)

MongoDB\Driver\Server::getLatency — Returns the latency of this server in milliseconds

### Descripción

final public MongoDB\Driver\Server::getLatency(): ?integer

Returns the latency of this server in milliseconds. This is the client's measured » round trip time of a `hello` command.

### Parámetros

Esta función no tiene parámetros.

### Valores devueltos

Returns the latency of this server in milliseconds, or `null` if no latency has been measured (e.g. client is connected to a load balancer).

### Errores/Excepciones

- Lanza una MongoDB\Driver\Exception\InvalidArgumentException en errores de análisis de argumentos.

### Historial de cambios

Versión | Descripción
--- | ---
PECL mongodb 1.11.0 | This method will return `null` if no latency has been measured. In earlier versions, an integer was always returned and an unset value might be reported as `-1`.

### Ejemplos

Ejemplo #1 MongoDB\Driver\Server::getLatency() example

`<?php
$manager = new MongoDB\Driver\Manager("mongodb://localhost:27017/");
$rp = new MongoDB\Driver\ReadPreference(MongoDB\Driver\ReadPreference::RP_PRIMARY);
$server = $manager->selectServer($rp);
var_dump($server->getLatency());
?>`

El resultado del ejemplo sería algo similar a:

    int(592)

### Ver también

- MongoDB\Driver\Server::getInfo() - Returns an array of information describing this server
- MongoDB\Driver\ServerDescription::getRoundTripTime() - Returns the server's round trip time in milliseconds
- » Server Discovery and Monitoring Specification