get_PDF

function get_PDF($user_id, $qr_url, $datos){

   require_once('library/tcpdf/tcpdf.php');
   $size = array(216,279);
   $pdf = new TCPDF('L', PDF_UNIT, $size, true, 'UTF-8', false);
   $pdf->setPrintHeader(false);
   $pdf->setPrintFooter(false);
   $pdf->SetAutoPageBreak(TRUE, 0);
   $pdf->AddPage();

   $datoshtml =    '<h4>      ' . substr($datos['nombres'], 0, 1)
                   . substr($datos['appellido1'], 0, 1)
                   . substr($datos['appellido2'], 0, 1)
                   . '</h4><h4>      '
                   . $datos['escuela']
                   . '</h4><h4>     '
                   . $datos['grado_escolar']
                   . '</h4>';

   $html = '
   <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
   <table width="610">
       <tr>
           <td>
           </td>
           <td>
           </td>
           <td width="310" style="border: 1px solid #000;">
               <table>
                   <tr>
                       <td>
                       </td>
                       <td colspan="2">
                           ' . $datoshtml . '
                       </td>
                   </tr>
                   <tr><td></td><td></td><td></td></tr>
               </table>
           </td>
       </tr>
   </table>
';
   $pdf->writeHTML($html, true, false, true, false, '');

   $pdf->setJPEGQuality(40);
   $pdf->Image($qr_url, 156, 164, 35, 35, 'PNG');

   $dir = wp_upload_dir();
   $outfile = $dir['basedir'] . '/users-files/pdf_'. $user_id . '.pdf';
   $pdf->Output($outfile, 'F');

   return $outfile;

}