Custom URL shortener script for Mobile Apps

I am thinking to develop to develop a custom URL shortener script that will do the following: - Shorten a web link to be opened on a mobile application. - It should be supporting Android and iOS - Check if the app is installed or no - If the app is not installed it should take the user to the download link on Apple Appstore or Google Play. - If the app is installed it should open on the application. - If the user is using a desktop it should link to the desktop page. Deliverables: 1. Android and iOS library that can be integrated to applications. 2. PHP server side script to handle those requests 3. An API to generate those custom shortened URLs I wish you all best of luck :-)