SQL query for custom taxonomy slugs
global $wpdb; $slugs = $wpdb->get_col( “SELECT slug FROM $wpdb->terms LEFT JOIN $wpdb->term_taxonomy ON $wpdb->terms.term_id = $wpdb->term_taxonomy.term_id WHERE $wpdb->term_taxonomy.taxonomy = ‘course'” ); That will return an array of strings representing the taxonomy term slugs for terms in the course taxonomy.