I have some basic knowledge of building android apps using Android Studio with Java language. Now I want to start learning flutter but not really sure about a couple of things. I read that it's possible to build cross-platform mobile apps with flutter and I can use an android studio to build those apps. Using flutter its also possible to build a website and desktop projects.
My confusions are :
1) Can I use Android Studio IDE with flutter to build mobile apps(both Android & IOS), desktop apps and websites?
2) First of all, I thought I just write a single code for both mobile apps and websites but guess I am wrong. So, if codes are different for mobile apps and website then how different are they? I mean is it something totally different or has some similarities. So, if someone can build a mobile app using flutter then they can easily build a website with flutter too?
3) Can flutter web be used instead of PHP for making websites and web services?