From Codeigniter to mobile app development

[eluser]ivantcholakov[/eluser]
Here you are some phrases for helping your research:

"api driven website"
"api driven development"

Edit:

"api centric web application" - https://cdn.tutsplus.com/net/uploads/leg...entric.png

http://code.tutsplus.com/tutorials/creat...-net-23417

Edit 2:

Yet another phrase: "RESTfull services"
There is a REST library for CodeIgniter, also you may find a framework-agnostic package.