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I'm not on board. Even though we have a small shop (3) I do all of the PHP/MySQL and the designer does all of the html, css, javascript. We have standardized outputs that we've agreed upon for the html markup so that I can generate commonly used code (forms) automatically but he marks everything up. Why? Because he's really good at it. I know semantic HTML pretty well and CSS so-so. He knows a little PHP. This *works* for our group. I think basic understanding of what your co-workers do is important but you can spread yourself too thin.

These aren't skills, they're languages. The article should be called "Languages to Learn to Become a Front-End PHP Developer."

@jakyra you see i never said that you should do all the stuff yourself, i said you should know the stuff, so that if your co-worker fall sick you work don't get stopped... and i am sure you must have some standard way for covering that.. but i don't believe in my work getting stopped because of a single person not showing up for the day.... and anyways you said you know the stuff.. hence my point proven, even in your cool group you need to know the HTML and css.

@tsubasa, they might be languages, but using them is a skill that you can't just learn in a book, or else every person who read a book would become a super programmer.

Oh I see, so what makes this article an important read is that you don't just say people should LEARN PHP, you say they should learn it WELL. So what makes you a great web developer is being good at what you do. Makes sense...

I know CSS but it doesn't do me any good because I'm still a shitty designer with no eye for anything. HTML and Javascript I can help with though.

This would not make you a good web application developer, it would make you good at creating brochure webpages.

To develop web applications the list need to be turned around completly. Sure html, css and javascript is important but the database and backend language (insert your favorite database and language) are several times as important.

If you or someone else on your team are not able to master complicated by efficient sql queries, or creating the most efficient and flexible backend code (read OOP) then you are not really able to create an efficient web application.