How do I automatically delete flash_data message after it is displayed in codeigniter

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elseif($aulas_professor[0]['controle_aula'] == 0){
   $desativado = $this->session->set_flashdata('desativado', "O Professor selecionado Não está ativado ,ative-o e tente novamente!");
   return $this->calendario($desativado);
}
codeigniter

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It is not necessary. A documentation informs that this type of data is self-destructed (Below, excerpt from the documentation, in free translation):

Coedigniter supports "flashdata", or session data that is only available for the next request and will be automatically deleted.

If you are using the method set_flashdata()from the session library to mark, you no longer need to do anything to erase this data.

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