Do Upload

function do_upload2()
    {
        $config['upload_path'] = './temp_upload/';
        $config['allowed_types'] = 'xls';

        $this->load->library('upload', $config);

        if ( ! $this->upload->do_upload())
        {
            $data = array('error' => $this->upload->display_errors());
            $this->session->set_flashdata('msg_excel', 'Insert failed. Please check your file, only .xls file allowed.');
        }
        else
        {
            $data = array('error' => false);
            $upload_data = $this->upload->data();

            $this->load->library('excel_reader');
            $this->excel_reader->setOutputEncoding('CP1251');

            $file =  $upload_data['full_path'];
            $this->excel_reader->read($file);
            error_reporting(E_ALL ^ E_NOTICE);

            // Sheet 1
            $data = $this->excel_reader->sheets[0] ;
            // Ambil Data
            $dataexcelalumni = Array();
            for ($i = 1; $i <= $data['numRows']; $i++) {
                if($data['cells'][$i][1] == '') break;
                $tgl_lhr    = $data['cells'][$i][6];
                $date_lahir = date('Y-m-d', strtotime($tgl_lhr));
                $tgl_masuk = $data['cells'][$i][9];
                $date_masuk = date('Y-m-d', strtotime($tgl_masuk));
                $tgl_lulus = $data['cells'][$i][10];
                $date_lulus = date('Y-m-d', strtotime($tgl_lulus));

                $dataexcelalumni[$i-1]['alumni_nim'] = $data['cells'][$i][1];
                $dataexcelalumni[$i-1]['alumni_nama'] = $data['cells'][$i][2];
                $dataexcelalumni[$i-1]['fakultas_id'] = $data['cells'][$i][3];
                $dataexcelalumni[$i-1]['progdi_id'] = $data['cells'][$i][4];
                $dataexcelalumni[$i-1]['alumni_tmpt_lhr'] = $data['cells'][$i][5];
                $dataexcelalumni[$i-1]['alumni_tgl_lhr'] = $date_lahir;
                $dataexcelalumni[$i-1]['alumni_hp'] = $data['cells'][$i][7];
                $dataexcelalumni[$i-1]['alumni_agama'] = $data['cells'][$i][8];
                $dataexcelalumni[$i-1]['alumni_tgl_masuk'] = $date_masuk;
                $dataexcelalumni[$i-1]['alumni_tgl_lulus'] = $date_lulus;
                $dataexcelalumni[$i-1]['user_username'] = $data['cells'][$i][11];
                $dataexcelalumni[$i-1]['user_password'] = $data['cells'][$i][12];
            }

            //cek data
            $check= $this->import_model->search_nim($dataexcelalumni);
            if (count($check) > 0)
            {
                $this->import_model->update_alumni($dataexcelalumni);
            }
            else
            {
                $this->import_model->insert_alumni($dataexcelalumni);
            }
        }

        delete_files($upload_data['file_path']);
        $data['data_import'] = $this->import_model->select_import()->result(); // Insert Data Users
        $this->template->display('panel/hasil_import_v', $data);
    }