Characters Encoding Issue

[KvRae]

So I am working with Arabic characters in my generated pdf but it keeps displaying this "?" instead! any suggestion on how to solve this issue?
the page that I want:

the output of the dompdf:

[bsweeney]

Have you read through the Unicode How-To? Basically, specify a font that supports your characters (e.g. DejaVu Sans). The core PDF fonts do not.

Regardless, output will not be as expected because Dompdf does not yet fully support complex text layout (see #2619). You can get some info on how to improve rendering of Arabic in #712.