Most PHP devs I've worked with (myself included) would consider these tips so trivial as to be expected knowledge. So don't be so unfair on PHP developers--the good ones find the ridiculous questions on PHP.net, and articles like this, just as stupid as you apparently do.
I'm a long was from being unfair. I think given the site this article is posted on my statement shouldn't have been hard to follow the context. There is a lot, and I mean a lot of PHP code being written by designers and very inexperienced 'developers', this article is geared towards /hopefully/ correcting some of the common mistakes the original article was promoting. I also don't think it's unfair to say most PHP users fall into this category.