| Horde_Stream | Object that adds convenience/utility methods to interacting with PHP streams. |
| Horde_Stream_Exception | Exception handler for the Horde_Stream package. |
| Horde_Stream_Existing | Implementation of Horde_Stream for an existing stream resource. This resource will be directly modified when manipulating using this class. |
| Horde_Stream_String | Implementation of Horde_Stream that uses a PHP native string variable for the internal storage. |
| Horde_Stream_Temp | Implementation of Horde_Stream for a PHP temporary stream. |
| Horde_Stream_TempString | Implementation of Horde_Stream that uses a PHP native string variable until a certain size is reached, at which point it converts storage to a PHP temporary stream. |