keep_flashdata($key) 
| Parameters: | 
  |  
|---|---|
| Returns: | 
 TRUE on success, FALSE on failure  |  
| Return type: | 
 bool  |  
Retains the specified session data key(s) as “flashdata” through the next request.
Note
This is a legacy method kept only for backwards compatibility with older applications. It is just an alias for the mark_as_flash() method.
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