Simple class, solely for setting "globals"
If these are constants, use const, not static:

class VERS {
    const css = '_214';
    const js = '_167';
    const image = '_56';
    const other = '_19';
}


and then

echo .....VERS::css....


As to whether this is a good idea in general, it would be helpful to show a bigger picture: what the rest of config looks like? how it's used? etc.