The problems with most of the about.com tutorials and most tutorials like that is that they are very beginner friendly and although they teach you the skills to get-the-job-done they lack the technical concepts and information to teach you cleaner,shorter, and more better code in the sense that it accomplishes the task at many different levels as opposed to one linear goal.
At the same time its not really effective as most of the shit you learn will never be used in day to day programming, that being said it certainly does come in useful.
For the OP since you do know html, and possible some javascript it should be fairly easy to get started on php, since it is extermely n0ob friendly i believe, well compared with other server-side lanuages anyhow.As for some good books the sitepoint anthology is decent and as Bofu2U said since your not trying to learn to code for a living or anything 10 hours on about.com will prepare you for most php/mysql tasks today.