I've been looking for creating a pdf using php without using a library but when I was looking on google for this I am not being able find any information how a pdf is made within php. Now I know the simple answer is 'Look at the code of an existing library'. But this does not give me much detail and how/why certain lines of codes are being used and what is or what isn't bad practice.
I hope, any of you have some prior experience with this and can help me out.