PHP Manual: MongoDB\Driver\Server::getLatency

final public function 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.

This function has no parameters.

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).

Version	Description
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`.

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

<?php

$manager = new MongoDB\Driver\Manager("mongodb://localhost:27017/");
$server = $manager->selectServer();

var_dump($server->getLatency());

?>

The above example will output something similar to:

int(592)

MongoDB\Driver\Server::getLatency