Pass data between pages

If there is a referrer ($_SERVER[‘HTTP_REFERER’], it’s not the best but could do the job here), you can retrieve the taxonomies as Mark proposed and inside the loop you display only the on corresponding to the referrer.

Advanced Taxonomy Queries WordPress

This is not a complete answer, but I hope this can help. It sounds like what you’re looking for is a “Faceted” navigation (or search or browsing) plugin. There are some plugins that do this already, like this one (from the FCC!). It’s possible that none of the existing plugins will match your needs, but … Read more

Show Available Taxonomy List with Current Category

I’m not hundred percent sure but I think the widget in scribu’s plugin, Query Multiple Taxonomies, works exactly as you described. You can find plenty of resources on the subject on his blog. This plugin lets you do faceted search using multiple custom taxonomies. It has a drill-down widget with multiple display modes. Said widget … Read more

Changing taxonomy term by slug (wp_update_term)

As you hinted in your question, you could use get_term_by() to return an object or array containing the term’s id, then use it to update that term. Something like this should work: $your_term = get_term_by( ‘slug’, ‘your_slug’, ‘your_taxonomy’ ); if ( false !== $your_term ) { wp_update_term( $your_term->term_id, ‘your_taxonomy’, $args ); } References: http://codex.wordpress.org/Function_Reference/get_term_by http://codex.wordpress.org/Function_Reference/wp_update_term

Custom Post Type Taxonomy Filters

I would take a look at this page on the Codex: http://codex.wordpress.org/Class_Reference/WP_Query I think you need to override your query_posts() for your landing page, and controlling different queries with if() statements, depending on what areas of a form (guessing you’re using a form?) has filled in. For example: // Carry pagination through $args = array( … Read more

Use get_terms to get post_tags but limit to a taxonomy

I’m fairly certain that the taxonomies have nothing truly in common except posts that they share, so I think you can’t avoid running an actual query of posts, in order to learn which categories are candidates for your criteria. While, it may not be computationally the best method, you could do something like this… $args … Read more