I just started school (College).
I want to know what good links for learning oop php?
That's a nice tutorial. I also wrote one for Daniweb a year or so ago when I was doing a lot of PHP programming at Nokia. Here is the link: https://www.daniweb.com/programming/web-development/tutorials/484310/why-you-dont-want-to-mix-php-and-html-directly-
I'd also offer the link to http://www.phptherightway.com/ (thanks to pritaeas for the link some time ago) as a great resource. It's not specific to OOP, although it does help with a lot of the peripheral stuff like namespacing, autoloading, documentation and the like.