PHP GD

<?php
//content type
header('Content-Type: image/png');

//font
$font = 'bangla2.ttf';
$font_size = 20;
$width = 640;
$margin = 150;
//$text = "আমার সোনার বাংলা";

$text = "   Avgvi †mvbvi evsjv Avwg ‡Zvgv‡K fv‡jvevwm";

$text_a = explode(' ', $text);
$text_new = '';
foreach($text_a as $word){
    $box = imagettfbbox($font_size, 0, $font, $text_new.' '.$word);
    if($box[2] > $width - $margin*2){
        $text_new .= "\n".$word;
    } else {
        $text_new .= " ".$word;
    }
}
$text_new = trim($text_new);
$box = imagettfbbox($font_size, 0, $font, $text_new);
$height = $box[1] + $font_size + $margin * 2;

$im = imagecreatefromjpeg('bg.jpg');

$white = imagecolorallocate($im, 255, 255, 255);
$black = imagecolorallocate($im, 0, 0, 0);

imagettftext($im, $font_size, 0, $margin, $font_size+$margin, $black, $font, $text_new);

imagepng($im);
imagedestroy($im);