E-mail pdf document before saving in a folder

I have the following code which generates a pdf certificate and saves it in a folder. 

$this->data['html'] = $html;

$filename = $userid;
$pdfFilePath = FCPATH."assets/downloads/reports/".$filename.".pdf";

$data['page_title'] = 'Certificate'; // pass data to the view
unlink($pdfFilePath); 
if (file_exists($pdfFilePath) == FALSE) {
    ini_set('memory_limit','32M'); 
$this->load->library('pdf');
    $pdf = $this->pdf->load();
    $pdf->SetFooter($_SERVER['HTTP_HOST'].'|{PAGENO}|'.date(DATE_RFC822)); 
$pdf->WriteHTML($html); // write the HTML into the PDF
$pdf->Output($pdfFilePath, 'F'); // save to file because we can
redirect("assets/downloads/reports/$filename.pdf"); 
}
else {
echo "Some problem is their, please contact admin regarding this..";
}
$this->load->view('certificate', $this->data);
}

However, I would like to send the same certificate after generation through e-mail to a recipient. What do I need to do?

Regards

Charles

However, I would