Return the ReadConcern for the Manager

# MongoDB\Driver\Manager::getReadConcern

(mongodb >=1.1.0)

MongoDB\Driver\Manager::getReadConcern — Return the ReadConcern for the Manager

### 说明

final public function MongoDB\Driver\Manager::getReadConcern(): MongoDB\Driver\ReadConcern

Returns the MongoDB\Driver\ReadConcern for the Manager, which is derived from its URI options. This is the default read concern for queries and commands executed on the Manager.

### 参数

此函数没有参数。

### 返回值

The MongoDB\Driver\ReadConcern for the Manager.

### 错误／异常

- Throws MongoDB\Driver\Exception\InvalidArgumentException on argument parsing errors.

### 示例

示例 #1 MongoDB\Driver\Manager::getReadConcern() example

    <?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());

    ?>

以上示例的输出类似于：

    object(MongoDB\Driver\ReadConcern)#2 (0) {
    }
    object(MongoDB\Driver\ReadConcern)#1 (1) {
      ["level"]=>
      string(5) "local"
    }

### 参见

- MongoDB\Driver\ReadConcern
- MongoDB\Driver\Manager::__construct() - Create new MongoDB Manager

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