Returns the cluster time for this session

# MongoDB\Driver\Session::getClusterTime

(mongodb >=1.4.0)

MongoDB\Driver\Session::getClusterTime — Returns the cluster time for this session

### 説明

final public function MongoDB\Driver\Session::getClusterTime(): ?object

Returns the cluster time for this session. If the session has not been used for any operation and MongoDB\Driver\Session::advanceClusterTime() has not been called, the cluster time will be `null`.

### パラメータ

この関数にはパラメータはありません。

### 戻り値

Returns the cluster time for this session, or `null` if the session has no cluster time.

### エラー / 例外

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

### 参考

- MongoDB\Driver\Session::advanceClusterTime() - Advances the cluster time for this session

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