Proper way to update the slug of a taxonomy using register_taxonomy? [duplicate]

Question

What is the best way to update the slug of a custom taxonomy that is registered by a plugin? I want to know the minimal amount of parameters for this or if i need to go and copy paste all of the original parameters. This seems like it can be error prone if the plugin has an update. The codex says you will overwrite the original when using register_taxonomy so is there a better way to do this or a different function?

Answer 1

register_taxonomy triggers the action registered_taxonomy immediately after it's registered, which gives you the arguments it was registered with. As long as the taxonomy key doesn't change, you can hook that action, modify the arguments, then re-register it.

function wpd_update_taxonomy_args( $taxonomy, $object_type, $args ){
    if( 'plugin_tax' == $taxonomy ){

        // remove this action so we don't create an infinite loop!
        remove_action( current_action(), __FUNCTION__ );

        // change arguments
        $args['rewrite'] = array( 'slug' => 'foobar' );

        // re-register
        register_taxonomy( $taxonomy, $object_type, $args );
    }
}
add_action( 'registered_taxonomy', 'wpd_update_taxonomy_args', 10, 3 );