It's perfectly fine to answer a self question, but when I saw your question my fingers just wanted to write:
Sharing your research helps everyone. Tell us what you've tried and why it didn’t meet your needs. This demonstrates that you’ve taken the time to try to help yourself. It saves us from reiterating obvious answers, and most of all it helps you get a more specific and relevant answer! (sourcesource)
I mean, the question should be good and provide reasonable information, so that other users can answer too regardles of the self answer.
What I (maybe the community too) feel when I see your question (I am not either concern answer or taking):
Is it possible to add glow or a shadow to text in GD?
Please do some effort. Spend some time in research (google) to show effort.
@replay to your comment
The imagettftext function is somewhat poorly named and could be called add_text_to_existing_image.
Well, it is not a reason at all to change the name of the function since it is poorly named. I think imagettftext ( image(i) TrueType(tt) fonts(f) text )
is fine already