[mothered]

As a starting point, checkout my thread here:

https://sinister.li/Thread-Tutorial-Learn-PHP

You can then broaden your knowledge via your own volition using other online resources. There's heaps available.
Just remember, online tutorials only guide you to a certain point, hence to be a good coder you need to generate quite a bit of effort on your part. When you can manipulate your code (over and over again) and get It to function correctly without giving too much forethought, then you know you're well on the way to mastering the language.