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Revision: 64314
at July 23, 2013 15:31 by JoshChris
Initial Code 
<?php 

  include('wp-load.php');

  $nike = get_term_by('slug','nike','brand'); // This here just to illustrate

  $terms = get_cross_referenced_terms(array(
    'post_type'        => 'product',
    'related_taxonomy' => 'brand',
    'term_id'          => $nike->term_id,
  ));
  foreach($terms as $term) {
    echo "<p>{$term->name}</p>";
  }

function get_cross_referenced_terms($args) {
  global $wpdb;
  $args = wp_parse_args($args,array(
    'post_type'        => 'post',
    'taxonomy'         => 'category',
    'related_taxonomy' => 'post_tag',
    'term_id'          => 0,
  ));
  extract($args);
  $sql = <<<SQL
SELECT DISTINCT
  {$wpdb->terms}.*,
  COUNT(*) AS post_count
FROM
  {$wpdb->terms}
  INNER JOIN {$wpdb->term_taxonomy} ON {$wpdb->terms}.term_id={$wpdb->term_taxonomy}.term_id
  INNER JOIN {$wpdb->term_relationships} ON {$wpdb->term_taxonomy}.term_taxonomy_id={$wpdb->term_relationships}.term_taxonomy_id
  INNER JOIN {$wpdb->posts} ON {$wpdb->term_relationships}.object_id={$wpdb->posts}.ID
  INNER JOIN {$wpdb->term_relationships} related_relationship ON {$wpdb->posts}.ID=related_relationship.object_id
  INNER JOIN {$wpdb->term_taxonomy} related_term_taxonomy ON related_relationship.term_taxonomy_id=related_term_taxonomy.term_taxonomy_id
  INNER JOIN {$wpdb->terms} related_terms ON related_term_taxonomy.term_id=related_terms.term_id
WHERE 1=1
  AND (related_term_taxonomy.taxonomy<>{$wpdb->term_taxonomy}.taxonomy OR related_terms.term_id<>{$wpdb->terms}.term_id)
  AND {$wpdb->posts}.post_type='%s'
  AND {$wpdb->term_taxonomy}.taxonomy='%s'
  AND related_term_taxonomy.taxonomy='%s'
  AND related_terms.term_id=%d
GROUP BY
  {$wpdb->terms}.term_id
SQL;
  $sql = $wpdb->prepare($sql,$post_type,$taxonomy,$related_taxonomy,$term_id);
  $terms = $wpdb->get_results($sql);
  return $terms;
}
Initial URL 
http://wordpress.stackexchange.com/a/11005
Initial Description 
Get all custom taxonomies that are attached to posts that have another custom taxonomy. Like fetching all categories that are attached to products that have the brand taxonomy "Nike".
Initial Title 
Get all custom taxonomies that are attached to posts that have another custom taxonomy
Initial Tags 
wordpress
Initial Language 
PHP