Replace in portfolio_category

Hi there:

Sorry for repeating the same post for other users, I have read all but I can not change the “portfolio_category” with “xxx”.

Changes here?

register_taxonomy (‘portfolio_category’, ‘portfolio’, array (‘hierarchical’ => true, ‘label’ => ‘Portfolio Categories’, ‘query_var’ => true, ‘rewrite’ => true));

my_option_posts_per_page function ($ value) {
     global $ option_posts_per_page;
     if (is_tax (‘portfolio_category’)) {
         return (ot_get_option (‘portfolio_items_per_page’, 9) ot_get_option (‘portfolio_items_per_page’, 9): 9?)
     Else {}
         return $ option_posts_per_page;
     }
}

Please Can you help? thank you

* Translated with google translator ….