I new to the development stuff here. I would like to know whether is it possible to use PHP script to create a web service and run it on cloud hosting? How about the web service I created using Java? Can it be ran on the cloud hosting as well?
Currently I am using a free cloud hosting from www.000webhost.com (Free Web Hosting).
Yes. You can create a web-service in PHP, on a free hosting provider. But in case of the free-webhosts, you don't get your dedicated machine to run your Java webservice on, so you will have to redesign the entire thing in PHP.
With free-hosting, you do run into limitations, so buying a hosting package is better. A lot of them insert their own snippets of "Powered by xxx Hosting" strings into all your pages, that break any XML you are serving, so please keep that in mind.