Jakobuz

<?php
require_once dirname( __FILE__ ) . '/class.settings-api.php';

/**
 * Theme Admin panel for Tareq's Planet
 *
 * @author Tareq Hasan
 */
class Tareqs_Planet_Admin {

Jakobuz

add_filter('posts_clauses', 'posts_clauses_with_tax', 10, 2);
function posts_clauses_with_tax( $clauses, $wp_query ) {
	global $wpdb;
	//array of sortable taxonomies
	$taxonomies = array('example-taxonomy', 'other-taxonomy');
	if (isset($wp_query->query['orderby']) && in_array($wp_query->query['orderby'], $taxonomies)) {
		$clauses['join'] .= "
			LEFT OUTER JOIN {$wpdb->term_relationships} AS rel2 ON {$wpdb->posts}.ID = rel2.object_id
			LEFT OUTER JOIN {$wpdb->term_taxonomy} AS tax2 ON rel2.term_taxonomy_id = tax2.term_taxonomy_id
			LEFT OUTER JOIN {$wpdb->terms} USING (term_id)

Jakobuz

/*
 * Filter the wp_get_archives() so a cat_id can be added
 * Example: wp_get_cat_archives('type=monthly&format=option&show_post_count=1', 46);
 * in this case '46' = the category id
 */

add_filter('getarchives_where', 'custom_archives_where', 10, 2);
add_filter('getarchives_join', 'custom_archives_join', 10, 2);

function custom_archives_join($x, $r) {

Jakobuz

$taxonomies = array( 
    'custom_category'    
);

$args = array(
    'orderby'       => 'name', 
    'order'         => 'ASC',
    'hide_empty'    => false, 
    'exclude'       => array(), 
    'exclude_tree'  => array(),