%\MongoDB\Driver\WriteConcern% Two nodes:
$wc = new MongoDB\Driver\WriteConcern( 2 ); Majority of nodes:
$wc = new MongoDB\Driver\WriteConcern( MongoDB\Driver\WriteConcern::MAJORITY ); With timeout:
$wc = new MongoDB\Driver\WriteConcern( MongoDB\Driver\WriteConcern::MAJORITY, 10000 ); db->collection->insertOne( [ '_id' => 1, 'x' => 1 ], [ 'writeConcern' => $wc ], ); ]]>