Information

INFO - Font file dejavusans contains characters in Unicode Plane 1 SMP
INFO - Font file dejavusanscondensed contains characters in Unicode Plane 1 SMP
INFO - Font file dejavusansmono contains characters in Unicode Plane 1 SMP
INFO - Font file dejavuserif contains characters in Unicode Plane 1 SMP
INFO - Font file dejavuserifcondensed contains characters in Unicode Plane 1 SMP

Font names as parsed by mPDF

"DejaVu Sans" font is available as dejavusans
"DejaVu Sans Condensed" font is available as dejavusanscondensed
"DejaVu Sans Mono" font is available as dejavusansmono
"DejaVu Serif" font is available as dejavuserif
"DejaVu Serif Condensed" font is available as dejavuserifcondensed
"Open Sans" font is available as opensans

Sample config_fonts.php file

Remember to edit the following arrays to place your preferred default first in order:
$this->fontdata = array (
  'dejavusans' => 
  array (
    'B' => 'DejaVuSans-Bold.ttf',
    'BI' => 'DejaVuSans-BoldOblique.ttf',
    'I' => 'DejaVuSans-Oblique.ttf',
    'R' => 'DejaVuSans.ttf',
  ),
  'dejavusanscondensed' => 
  array (
    'B' => 'DejaVuSansCondensed-Bold.ttf',
    'BI' => 'DejaVuSansCondensed-BoldOblique.ttf',
    'I' => 'DejaVuSansCondensed-Oblique.ttf',
    'R' => 'DejaVuSansCondensed.ttf',
  ),
  'dejavusansmono' => 
  array (
    'B' => 'DejaVuSansMono-Bold.ttf',
    'BI' => 'DejaVuSansMono-BoldOblique.ttf',
    'I' => 'DejaVuSansMono-Oblique.ttf',
    'R' => 'DejaVuSansMono.ttf',
  ),
  'dejavuserif' => 
  array (
    'B' => 'DejaVuSerif-Bold.ttf',
    'BI' => 'DejaVuSerif-BoldItalic.ttf',
    'I' => 'DejaVuSerif-Italic.ttf',
    'R' => 'DejaVuSerif.ttf',
  ),
  'dejavuserifcondensed' => 
  array (
    'B' => 'DejaVuSerifCondensed-Bold.ttf',
    'BI' => 'DejaVuSerifCondensed-BoldItalic.ttf',
    'I' => 'DejaVuSerifCondensed-Italic.ttf',
    'R' => 'DejaVuSerifCondensed.ttf',
  ),
  'opensans' => 
  array (
    'B' => 'OpenSans-Bold.ttf',
    'BI' => 'OpenSans-BoldItalic.ttf',
    'I' => 'OpenSans-Italic.ttf',
    'R' => 'OpenSans-Regular.ttf',
  ),
);
$this->sans_fonts = array('dejavusans', 'dejavusanscondensed', 'opensans');
$this->serif_fonts = array('dejavuserif', 'dejavuserifcondensed');
$this->mono_fonts = array('dejavusansmono');