To check whether the music symbol ♫ is being displayed in a string (if it is not being displayed on some devices), you can try measuring the string width; if width == 0 then the symbol is absent.

I want to check if the String I am about to display can be displayed by my custom font.

I can't find a method to check if my Typeface can display a particular String though.

I want to be able to detect if the font used can display a certain character or not

How I can know which glyph the font does not support in that list?

$ python checkfont.py /usr/share/fonts/**/DejaVuSans.ttf 65 12622 # a ㅎ

The script takes as arguments the font path and optionally code points / characters to search for:

Determine if a glyph exists in a given font

I'm looking to see if there is a way, in PHP, to determine if a glyph exists for a given character in a font.