[CSSer]

Out of curiosity, what’s the motivation to error suppress the mkdir call here (my PHP is rusty)? Anyway, this is great. Thank you for sharing!

[okasaki]

It returns an error if the directory already exists (same as in Python)

[uneekname]

While we're on the topic, in Python there's a nice way to deal with this:

os.makedirs(path, exist_ok=True)