TCPDF Tamil Unicode Issue

My Code is

setFontSubsetting(true);

$fontname = TCPDF_FONTS::addTTFfont(‘../fonts/freeserif.ttf’, ‘TrueTypeUnicode’, ”, 96);
$pdf->setFont($font_family=’freeserif’,$font_variant=”,$font_size=10);

$pdf->AddPage();

$utf8text = ‘

தமிழ் தமிழ் குதிரை

‘;

$pdf->writeHTML($utf8text, true, 0, true, true);

$pdf->Output(‘example_008.pdf’, ‘I’);

?>

but tamil letter குதிரை not properly showing now.

enter image description here

TAMIL UNICODE CHARACTERS IN PDF CORRECTLY