php – 在imagettftext()中使用马拉雅拉姆语单词

// malayalam word
$utf8str = "???????";

// buffer output in case there are errors
ob_start();

// create blank image
$im = imagecreatetruecolor(400,40);
$white = imagecolorallocate($im,255,255);
imagefilledrectangle($im,imagesx($im),imagesy($im),$white);

// write the text to image
$font = "anjali.ttf";
$color = imagecolorallocatealpha($im,50,0); // dark gray
$size = 20;
$angle = 0;
$x = 5;
$y = 25;
imagettftext($im,$size,$angle,$x,$y,$color,$font,$utf8str);

// display the image,if no errors
$err = ob_get_clean();
if( !$err ) {
    header("Content-type: image/png");
    imagepng($im);
}

使用此代码,我得到以下输出

我已经尝试了很多来自stackoverflow的Malayalam字体和代码.任何人都可以帮我吗？