As kgun mentioned, not all that you mentioned are languages. So I'll just use the word "tools" as a catch all phrase.
You know html, and css, both of which will serve you well. Javascript is fine, but realize that it has limitations. (Some browsers can't read it, or has it turned off)
Since you already know a little PHP, I'd say keep learning and experimenting with it.
MySQL is a great free database. Be sure to learn SQL commands, it will come in handy with any database. There are a lot of great resources on the web, here's one...
SQL Tutorial Databases are great, but unless you know how to get information to, and from it, they're useless. So learn and understand SQL commands. That'll make you a better PHP programmer.