# MongoDB\Driver\WriteConcern::getJournal

(mongodb >=1.0.0)

MongoDB\Driver\WriteConcern::getJournal — Returns the WriteConcern's "journal" option

### 说明

final public MongoDB\Driver\WriteConcern::getJournal(): ?bool

### 参数

此函数没有参数。

### 返回值

Returns the WriteConcern's "journal" option.

### 错误／异常

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

### 示例

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

`<?php
$wc = new MongoDB\Driver\WriteConcern(1);
var_dump($wc->getJournal());
$wc = new MongoDB\Driver\WriteConcern(1, 0, true);
var_dump($wc->getJournal());
$wc = new MongoDB\Driver\WriteConcern(1, 0, false);
var_dump($wc->getJournal());
?>`

以上示例会输出：

    NULL
    bool(true)
    bool(false)

### 参见

- » Write Concern reference

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