Correct Code

public function submit ()
                {
                        if(isset($_POST['cetak']))
                        {

 //do i wrong make variable data ?
$data = $this->penjualan_model->cetak();

//is that correct put $data here  ?
$PDFContent=$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;


        }




                else if (isset($_POST['cari']))
                {
                            $data['data'] = $this->penjualan_model->cetak();
                                $this->load->view('admin/laporan/cari_laporan', $data);

                }
}