If Then Question

I want to change how a field is displayed on the frontend depending on the rwmb_meta(), kind of like this:

<?php if( rwmb_meta() = '1' ) { ?>
...
<?php } elseif( rwmb_meta() = '2' ) { ?>
...
<?php } elseif( rwmb_meta() = '3' ) { ?>
...
<?php } else { ?>
...
<?php } ?>

where the number after = is whatever the value of rwmb_meta() is.

I know how to do this with general WP elements such as category or page, but how would I do it for Meta Box fields?