I can't find or don't know what to look for, i used to be a php programmer but i had to swap to asp/vb.net for working purposes. Thing is, i can't find or don't know how to look for information about how to create webservices but to run in php/apache/linux or php/apache/windows

Could someone give me just an example of a php webservice with just a helloworld() ?

Thanks in advance