contorller

public function submit ()
                {

                    //process cetak laporan
                        if(isset($_POST['cetak']))
                        {

if ($this->session->userdata('username')=="") {
            redirect('auth');
        }
$data['data'] = $this->penjualan_model->cetak();

$PDFContent=$this->load->view('admin/laporan/cetak_laporan', $data, true);

$url = 'http://freehtmltopdf.com';


$apiConfigData = array('convert' => '',
              'html' => $PDFContent,
              'baseurl' => base_url(),
              'width' => '210mm',
              'enablejs' => 0,
              'orientation' => 'portrait');


 //i'm still dont understand $data
$options = array('http' => array('header'  => "Content-type: application/x-www-form-urlencoded\r\n",
                                 'method'  => 'POST',
                                 'content' => http_build_query($apiConfigData)),);

$context  = stream_context_create($options);

$result = file_get_contents($url, false, $context);

header('Content-type: application/pdf');

echo $result;


        }

        //process cari laporan
        else if (isset($_POST['cari']))
        {

            if ($this->session->userdata('username')=="") {
            redirect('auth');
        }
                $data['user'] = $this->user_model->getaktif();
                $data['data'] = $this->penjualan_model->cetak();
                $data['username'] = $this->session->userdata('username');
                $this->load->view('admin/laporan/cari_laporan', $data);

        }





}