As of PHP 5.5.1, another method create_sid() is supported. It will be called when session_regenerate_id() is invoked.
SessionHandlerInterface {
/* Methods */
abstract public bool close ( void )
abstract public bool create_sid ( void )
abstract public bool destroy ( string $session_id )
abstract public bool gc ( int $maxlifetime )
abstract public bool open ( string $save_path , string $session_name )
abstract public string read ( string $session_id )
abstract public bool write ( string $session_id , string $session_data )
}
