Should I be worried about whether or not I'm a good PHP developer?

I recently ran into this article about 40 mistake PHP programmers make, and it generally made me feel lousy about my code and made me doubt my ability.

Just to list a few of the things from the article that I don’t do…

I try and comment my code with well, comments, i.e. // This is a comment. But the article refers to phpDoc?

What’s a programming IED? I’ve never used one…

Not sure what unit testing is, so I don’t think I do that.

I don’t allow intelligent error handling? I’m not sure, if anyone want to elaborate on these things that I’m not sure if I do that’d be great.

Ohkay, I admit I don’t know how to write regular expressions, I’ve never taken the time to learn them. Am I missing out?

The article

I don’t write my PHP in an object oriented way, I mean, it’s all OOP really, but I don’t make classes and such. My code is much more procedural and slim. Is this bad?

Just my personal doubts and such, feel free to comment, and explain those things I don’t get. Thanks!