Returns the ReadConcern's "level" option

# MongoDB\Driver\ReadConcern::getLevel

(mongodb >=1.0.0)

MongoDB\Driver\ReadConcern::getLevel — Returns the ReadConcern's "level" option

### 说明

final public function MongoDB\Driver\ReadConcern::getLevel(): ?string

### 参数

此函数没有参数。

### 返回值

Returns the ReadConcern's "level" option.

### 错误／异常

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

### 示例

示例 #1 MongoDB\Driver\ReadConcern::getLevel() example

    <?php

    $rc = new MongoDB\Driver\ReadConcern();
    var_dump($rc->getLevel());

    $rc = new MongoDB\Driver\ReadConcern(MongoDB\Driver\ReadConcern::LOCAL);
    var_dump($rc->getLevel());

    $rc = new MongoDB\Driver\ReadConcern(MongoDB\Driver\ReadConcern::MAJORITY);
    var_dump($rc->getLevel());

    ?>

以上示例会输出：

    NULL
    string(5) "local"
    string(8) "majority"

### 参见

- » Read Concern reference

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