fdf_error
  Return error description for FDF error code
  
 
 
  Description
  
   string fdf_error
    ([ int $error_code = -1
  ] )
  
  
 
  Parameters
  
   
    
     - 
error_code
- 
      
       An error code obtained with fdf_errno.
       If not provided, this function uses the internal error code set by the
       last operation.
       
 
 
  Return Values
  
   Returns the error message as a string, or the string 
   no error if nothing went wrong.