foreach ($this->__fields as $field => $value) {
                if (isset($clause_terms[$field])) continue;
                if ($this->$field != $this->htmldec($value)) {
                    $search_terms[$field] = array('value' => $this->s_prep($this->htmldec($this->$field)), 'term' => '=' );
                } else if (!is_null($this->$field) && is_null($value)) {