Edit using foreach (Edited)

Question

Good evening. I have a form where I want to edit some information from a certain sector. Since the select Eps are a foreach of the bank, but I want the ones I want to edit to be selected, however, in addition to selecting they are being duplicated. Follows the code:

<select title="Selecione os EPIs" multiple>

   <?php 

      $epi_explode = explode(',', $result->setor_EPI);

      foreach ($epis as $epi)
      { 
           foreach ($epi_explode as $epi_array)
           { ?>                   
              <option <?=$epi_array == $epi->epi_Nome ? 'selected' : '';?> > 
                  <?=$epi->epi_Nome?>
              </option>

     <?php } } ?>

</select>

Controler:

    public function index()
{   
    $data = array
    (
        'title' => 'Edição de Setores',
        'epis' => $this->setor_model->getEpis(),
    );

    $this->load->view('frame/cabecalho');
    $this->load->view('frame/navegacao');
    $this->load->view('setor/cadastro', $data);
}

Model da Query.

    public function getEpis()
{
    $this->db->select('*');
    $this->db->from('epi');
    return $this->db->get()->result();         
}

Follow the image of how to list the results.

The select list of the epi equipment, however I want only those that are in the database to be selected, because this is a page to edit such sector.