Create a new ReadConcern

# MongoDB\Driver\ReadConcern::__construct

(mongodb >=1.0.0)

MongoDB\Driver\ReadConcern::__construct — Create a new ReadConcern

### Description

final public MongoDB\Driver\ReadConcern::__construct ([ string `$level` ] )

Constructs a new MongoDB\Driver\ReadConcern, which is an immutable value object.

### Liste de paramètres

`level`

  The » read concern level. You may use, but are not limited to, one of the class constants.

### Erreurs / Exceptions

- Lance une exception MongoDB\Driver\InvalidArgumentException lors d'une erreur survenue pendant l'analyse d'un argument.

### Exemples

Exemple #1 MongoDB\Driver\ReadConcern::__construct() example

`<?php
/* Unspecified read isolation level (uses the server's default behavior) */
$rc = new MongoDB\Driver\ReadConcern();
/* Request read isolation from a single replica set node */
$rc = new MongoDB\Driver\ReadConcern(MongoDB\Driver\ReadConcern::LOCAL);
/* Request read isolation from a majority of the replica set nodes */
$rc = new MongoDB\Driver\ReadConcern(MongoDB\Driver\ReadConcern::MAJORITY);
?>`

### Voir aussi

- » Read Concern reference