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Source View: get_{$adjacent}_post_join

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Line Code
1028                     $posts_in_ex_cats_sql = " AND tt.taxonomy = 'category' AND tt.term_id NOT IN (" . implode($excluded_categories, ',') . ')';
1029                }
1030           }
1031      }
1032
1033      $adjacent = $previous ? 'previous' : 'next';
1034      $op = $previous ? '<' : '>';
1035      $order = $previous ? 'DESC' : 'ASC';
1036
1037      $join  = apply_filters( "get_{$adjacent}_post_join", $join, $in_same_cat, $excluded_categories );
1038      $where = apply_filters( "get_{$adjacent}_post_where", $wpdb->prepare("WHERE p.post_date $op %s AND p.post_type = %s AND p.post_status = 'publish' $posts_in_ex_cats_sql", $current_post_date, $post->post_type), $in_same_cat, $excluded_categories );
1039      $sort  = apply_filters( "get_{$adjacent}_post_sort", "ORDER BY p.post_date $order LIMIT 1" );
1040
1041      $query = "SELECT p.* FROM $wpdb->posts AS p $join $where $sort";
1042      $query_key = 'adjacent_post_' . md5($query);
1043      $result = wp_cache_get($query_key, 'counts');
1044      if ( false !== $result )
1045           return $result;
1046