[php] Install extensions

Could You tell me what is the difference between all php directories under Index of /repositories/server:/php ? I’m using OS 11.0 so I can choose between openSUSE_11.0/ , server_apache_openSUSE_11.0/ , server_database_apache_openSUSE_11.0/ and server_database_openSUSE_11.0/ . Worst thing is none of this repo is linked with php:/extensions . Who is responsible for all these builds?