Returns whether a key is present in the document

# MongoDB\BSON\Document::has

(mongodb >=1.16.0)

MongoDB\BSON\Document::has — Returns whether a key is present in the document

### 说明

final public function MongoDB\BSON\Document::has(string `$key`): bool

### 参数

`key` (string)
  The key to look for in the document.

### 返回值

Returns `true` if the key is present in the document and `false` otherwise.

### 错误／异常

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

### 参见

- MongoDB\BSON\Document::get() - Returns the value of a key in the document
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