Generate TTF via image(s) using PHP?

Are there existing libraries for generating .ttf via image(s) using PHP (say, a series of images)? There are several references about creating gdf from images, but I've not yet found examples of ttf-font creation via PHP.

N.B. There are also several online resour开发者_JS百科ces that let you upload an image (write a letter in each box on an image template) to be instantly converted to a TTF. http://www.yourfonts.com is one of them

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To my knowledge, there is no such tool.

Creating a TrueType font is a hugely difficult enterprise. A font consists of a lot of very complex information (see the "technical notes" in the Wikipedia article to get a tiny impression). It won't do to just paste a series of images together.

Depending on what you want to do, I suppose you could work around this by building a faux "bitmap font", one image file containing one character, and glue the correct images together to form a sentence. The results will probably be less than perfect, though, because there will be no Kerning.