<?php
$fileName = __DIR__ . "/DrawText.pdf"; 
$qp = new COM("DebenuPDFLibraryAX1113.PDFLibrary"); 
$validKey = $qp->UnlockKey(""); 


$text = '; স্কাউট হওয়া ভারি মজা ;   ; তোমাদের  জন্য মুক্তিযুদ্ধের গল্প ;';
$text = mb_convert_encoding($text, 'UTF-16'); // Convert UTF-8 to UTF-16 (with or without it produce same result)

// Add a subset font for the text string
$id = $qp->AddTrueTypeFontFromFile(__DIR__ . "/Fonts/SolaimanLipi.ttf"); //It's a unicode font that has my all my needed characters 
$qp->SelectFont($id);
$qp->DrawText(100, 600, $text);

$result = $qp->SaveToFile($fileName); 
$qp = null; 
?>