(PECL mongo >=0.9.0)
MongoGridFSCursor::key — Returns the current result's filename
This function has no parameters.
The current result's _id as a string.
| Version | Description | 
|---|---|
| PECL mongo 1.3.0 | The document's _idis returned as a string value,
        since the key should be unique. Pre-1.3.0,filenamewas returned. |