fox_and_potato

Hi, I have started using php a few days ago. I like what I've seen so far, but I have a question about inconsistent function name patterns. Consider fopen/fclose and opendir/closedir. Why not openfile/closefile, or dopen/dclose? I know that naming conventions evolve over time, and I would understand the difference if these functions came from different releases - but they both deal with elementary file system access, so I assume they were introduced in the same release? Not a complaint, I'm honestly just curious...