Welcome to the Browser-Base Game Zone forums!
I have my own coding style, other people have their own coding style. Most of us are here to work on fun and interesting browser games, we're not doing consultancy work or B2B work. As such PHP's session system or our own - little difference but preference, there is certainly no WRONG way of doing things. Don't be so ridiculous.
Well, to be fair; we are also here in order to talk about, debate and discuss all facets of browser-based game development, and that includes code and best practices. You might learn a thing or two and you might teach a thing or two, provided you don't have too much ego for the former and not enough patience for the latter.