If got a task to create a mobile application for iOS, Android and WP. This application needs to access a mySQL database which is already in use by the website running php.
What I found in the meantime, is that I have to create a php webservice and use this webservice to access the data in the mySQL database.
Since I did not found any clear advice which way is the best to do it (JSON, XML, REST, etc) - I just wanted to ask you, is there a kind of best practice which technologies should be used for the php webservice?
Additional it would be great for me if someone knows a good tutorial for the recommended technology.
Thanks a lot.