adding font to mPDF

How to adding font to mPDF?

Mpdf add Arial font

1. Download font file : https://github.com/JotJunior/PHP-Boleto-ZF2/blob/master/public/assets/fonts/arial.ttf
2. Paste the arial.ttf to mpdf/ttfonts
3. Open config_fonts.php and the below code with fontdata array
   "arial" => array( 'R' => "arial.ttf", ),

Source:https://stackoverflow.com/questions/17586409/adding-font-to-mpdf