[ft] php character map => filter unused characters?

[D.L.D.]

Hello

new to this list
And  i have a  question
i have a webpage that shows some fonts using php
http://www.phpenabled.com/ttf_fontlist/index.php

when a font is clicked
a page opens with the character map for that font with zoom layer popup
http://www.phpenabled.com/ttf_fontlist/fontlist.php?font=ETIMESBD.TTF

is it possible to filter out the rectangle and unused character?
is there a way to do this in php?
for example filter only the used characters of
http://www.phpenabled.com/ttf_fontlist/fontlist.php?font=Phones_NormalA.ttf

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