tcpdf header

I try to use writeHTML in function Header but i have this error:Undefined offset: 1

there’s no writeHTML function in Yii, as far as i know

Try Chtml::something

Is not a problem of Yii bug of tcpdf library.

I have no experience with this, I always used fpdf library instead without any integration problem.

Thanks, but i use library TCPDF and i have to add fixed header in my pdf this is a part of code:

class MYPDF extends TCPDF {

public function Header(){

$this->writeHTML($this->img, true, 0, true, 0);