Don't overlook at any books or tutorials from now. Go to the php docs alone. See stackoverflow for special queries only if stuck. Like any langs, start with low objectives. First try to do some maths, display the results. Then work with texts, try to alter contents by program. String, array, object, learn to create, and alter them. Later see by youself what kind of database type suits well your objectives. play with it (Flat files? json?). Wow you can pass external arguments by the url. (Big moment here ;) )

From there start to play with the internet, load remote datas, parse them, put them to your database. Then melt this all. Learn bash php scripting and unix, start to make system calls (exec, system, passthru...) enjoy the speed. Learn conditions (With just if you can do everything...seriously), Learn looping(while, foreach) , exit conditions and timing. Try to recreate basics tools: grep, cut, head, tail, cat.. you will see it is fairly doable and very funny to do.

Get bored? Do some javascript!

You will see personal ideas flowering at high rate. Still keep your objectives as low as you can. Small projects all aside.

Now you have all this in mind, open a book, check other sources code.

Learn security a bit. (Or not it all depends to your objective). Check good practices.

Close the books. Cut the Internet.

Get over this fancy libraries that anyone advise.

Open your editor. You are the internet. Have fun. ;)