<?php
$manager = new MongoDB\Driver\Manager('mongodb://localhost:27017');
var_dump($manager->getReadConcern());
$manager = new MongoDB\Driver\Manager('mongodb://localhost:27017/?readConcernLevel=local');
var_dump($manager->getReadConcern());
?>
The above example will output
something similar to:
object(MongoDB\Driver\ReadConcern)#2 (0) {
}
object(MongoDB\Driver\ReadConcern)#1 (1) {
["level"]=>
string(5) "local"
}