Yikes! I did a regular yum update tonight and got a whole bunch of dependency errors. It looks like the php packages in the repository have been renamed to "php4", which conflicts with the standard RHEL/CentOS/Fedora package names....
[root]# yum update
Setting up Update Process
Setting up repositories
kbs-CentOS-Extras 100% |=========================| 951 B 00:00
virtualmin 100% |=========================| 951 B 00:00
update 100% |=========================| 951 B 00:00
base 100% |=========================| 1.1 kB 00:00
virtualmin-universal 100% |=========================| 951 B 00:00
addons 100% |=========================| 951 B 00:00
extras 100% |=========================| 1.1 kB 00:00
Reading repository metadata in from local files
primary.xml.gz 100% |=========================| 15 kB 00:00
virtualmin: ################################################## 56/56
Added 1 new packages, deleted 0 old in 0.26 seconds
Resolving Dependencies
--> Populating transaction set with selected packages. Please wait.
---> Downloading header for virtualmin-base to pack into transaction set.
virtualmin-base-1.0-23.rh 100% |=========================| 13 kB 00:00
---> Package virtualmin-base.noarch 0:1.0-23.rh set to be updated
--> Running transaction check
--> Processing Dependency: wbt-virtual-server for package: virtualmin-base
--> Processing Dependency: php4-pear for package: virtualmin-base
--> Processing Dependency: php4 for package: virtualmin-base
--> Processing Dependency: php4-pgsql for package: virtualmin-base
--> Processing Dependency: mod_dav_svn for package: virtualmin-base
--> Processing Dependency: php4-xmlrpc for package: virtualmin-base
--> Processing Dependency: php4-gd for package: virtualmin-base
--> Processing Dependency: php4-odbc for package: virtualmin-base
--> Processing Dependency: php4-mysql for package: virtualmin-base
--> Processing Dependency: php4-domxml for package: virtualmin-base
--> Restarting Dependency Resolution with new changes.
--> Populating transaction set with selected packages. Please wait.
---> Downloading header for mod_dav_svn to pack into transaction set.
mod_dav_svn-1.1.4-2.ent.i 100% |=========================| 8.7 kB 00:00
---> Package mod_dav_svn.i386 0:1.1.4-2.ent set to be updated
--> Running transaction check
--> Processing Dependency: wbt-virtual-server for package: virtualmin-base
--> Processing Dependency: php4-pear for package: virtualmin-base
--> Processing Dependency: php4 for package: virtualmin-base
--> Processing Dependency: php4-pgsql for package: virtualmin-base
--> Processing Dependency: php4-xmlrpc for package: virtualmin-base
--> Processing Dependency: php4-gd for package: virtualmin-base
--> Processing Dependency: php4-odbc for package: virtualmin-base
--> Processing Dependency: php4-mysql for package: virtualmin-base
--> Processing Dependency: php4-domxml for package: virtualmin-base
--> Finished Dependency Resolution
Error: Missing Dependency: wbt-virtual-server is needed by package virtualmin-base
Error: Missing Dependency: php4-pear is needed by package virtualmin-base
Error: Missing Dependency: php4 is needed by package virtualmin-base
Error: Missing Dependency: php4-pgsql is needed by package virtualmin-base
Error: Missing Dependency: php4-xmlrpc is needed by package virtualmin-base
Error: Missing Dependency: php4-gd is needed by package virtualmin-base
Error: Missing Dependency: php4-odbc is needed by package virtualmin-base
Error: Missing Dependency: php4-mysql is needed by package virtualmin-base
Error: Missing Dependency: php4-domxml is needed by package virtualmin-base
[root]#