# MongoDB\BSON\Document::get

(mongodb >=1.16.0)

MongoDB\BSON\Document::get — Returns the value of a key in the document

### 说明

final public MongoDB\BSON\Document::get(string `$key`): mixed

### 参数

`key` (string)

  The key to retrieve from the document.

### 返回值

Returns the value associated with the given key. If the key is not present in the document, an exception is thrown.

> 注意: When encountering a value encoded as 64-bit integer in the BSON document, the return value of this method will be a MongoDB\BSON\Int64 instance.

### 错误／异常

- Throws MongoDB\Driver\Exception\InvalidArgumentException on argument parsing errors.
- Throws MongoDB\Driver\Exception\RuntimeException if the key is not present in the document.

### 参见

- MongoDB\BSON\Document::has() - Returns whether a key is present in the document
- » BSON Types

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