Returns the WriteConcern's "w" option

# MongoDB\Driver\WriteConcern::getW

(mongodb >=1.0.0)

MongoDB\Driver\WriteConcern::getW — Returns the WriteConcern's "w" option

### 说明

final public function MongoDB\Driver\WriteConcern::getW(): string|int|null

### 参数

此函数没有参数。

### 返回值

Returns the WriteConcern's "w" option.

### 错误／异常

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

### 示例

示例 #1 MongoDB\Driver\WriteConcern::getW() example

    <?php

    $wc = new MongoDB\Driver\WriteConcern(1);
    var_dump($wc->getW());

    $wc = new MongoDB\Driver\WriteConcern(MongoDB\Driver\WriteConcern::MAJORITY);
    var_dump($wc->getW());

    ?>

以上示例会输出：

    int(1)
    string(8) "majority"

### 参见

- » Write Concern reference

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