Can build an Android app by php ?

Answer 1

no you can not.
But you can use it in your app

Answer 2

Well I once made windows desktop application that uses http requests to communicate between my database and web server which i made with PHP.
I think that may be the only useful way to use PHP with application.

But you cant compile PHP with your android app.

Answer 3

@Toni
Possible to explain more .. How to use it within the application

Answer 4

@Toni Thanks