I'm sure you will find tutorials / etc on the net... PHP is easier to learn when you have a project in mind.
Get an idea, and start exploring the web after what you need.
Another advice, personally, the best way to code is to use 2 screens, when one has the code editor (IDE) and the second has the documentation opened to let you quickly search function names, etc.
For PHP I use chrome' addon: php docs-to-go, it does not need any internet connection, so you can browse the manual when having no internet (on trains, etc).
Good luck!