How to multiple upload files in codeigniter 3 - php

Question

i'm newbie on codeigniter and php, i just don't know how to upload multiple files..
I am able to upload & insert a image ine the database. But I am unable to upload multiple images, what should I change in the below code , in order to upload multiple images
help me, here is my code
Controller
public function index()
{
$data['title'] = 'Pengaduan';
$masyarakat = $this->db->get_where('masyarakat',['username' => $this->session->userdata('username')])->row_array();
$data['data_pengaduan'] = $this->Pengaduan_m->data_pengaduan_masyarakat_nik($masyarakat['nik'])->result_array();
$this->form_validation->set_rules('isi_laporan','Isi Laporan Pengaduan','trim|required');
$this->form_validation->set_rules('foto','Foto Pengaduan','trim');
if ($this->form_validation->run() == FALSE) :
$this->load->view('_part/backend_head', $data);
$this->load->view('_part/backend_sidebar_v');
$this->load->view('_part/backend_topbar_v');
$this->load->view('masyarakat/pengaduan');
$this->load->view('_part/backend_footer_v');
$this->load->view('_part/backend_foot');
else :
$upload_foto = $this->upload_foto('foto'); // parameter nama foto
if ($upload_foto == FALSE) :
$this->session->set_flashdata('msg','<div class="alert alert-danger" role="alert">
Upload foto pengaduan gagal, hanya png,jpg dan jpeg yang dapat di upload!
</div>');
redirect('Masyarakat/PengaduanController');
else :
$params = [
'tgl_pengaduan' => date('Y-m-d'),
'nik' => $masyarakat['nik'],
'isi_laporan' => htmlspecialchars($this->input->post('isi_laporan',true)),
'foto' => $upload_foto,
'status' => '0',
];
$resp = $this->Pengaduan_m->create($params);
if ($resp) :
$this->session->set_flashdata('msg','<div class="alert alert-primary" role="alert">
Laporan berhasil dibuat
</div>');
redirect('Masyarakat/PengaduanController');
else :
$this->session->set_flashdata('msg','<div class="alert alert-danger" role="alert">
Laporan gagal dibuat!
</div>');
redirect('Masyarakat/PengaduanController');
endif;
endif;
endif;
}
private function upload_foto($foto)
{
$config['upload_path'] = './assets/uploads/';
$config['allowed_types'] = 'jpeg|jpg|png';
$config['max_size'] = 2048;
$config['remove_spaces'] = TRUE;
$config['detect_mime'] = TRUE;
$config['mod_mime_fix'] = TRUE;
$config['encrypt_name'] = TRUE;
$this->load->library('upload', $config);
if ( ! $this->upload->do_upload($foto)) :
return FALSE;
else :
return $this->upload->data('file_name');
endif;
}
i tried using [] but it's show error, Is there a way to use this code so i can upload multiple images?