Where is a good place to start learning about php?

scottharrrules43

I was wanting to increase my knowledge on php programming. I watched Eli the computer guy php tutorials so I know some of the basics but where is a good "free resource" to use to learn more about php programming specifically for the game severs like setting up user name and passwords.

colander

I learned a lot of the basics here http://www.w3schools.com/php/default.asp

scottharrrules43

Thanks @colander‌