Thread:Project:Support desk/Cannot seem to install MediaWiki 1.18.1 on CentOS 5/reply (2)

Note, just because the cli php has the module enabled, doesn't mean that the apache version of php has the module enabled. You should also create a test page containing only  in order to make sure that the module is installed in your apache php as well.

The relavent functions in the installer seem to be looking for  to return true, in order to say that mysql support is available.