/**
  * get phrases from db
  */
 public function get_phrases()
 {
     $sql = "SELECT `phrase_key`, `phrase_value` FROM `" . $this->phrases . "`;";
     $phrases = $this->db->get_results($sql, ARRAY_A);
     $tmp_phrases = array();
     foreach ($phrases as $phrase) {
         if (!is_array($phrase)) {
             $phrase = stripslashes($phrase);
         }
         $tmp_phrases[$phrase['phrase_key']] = WC_Helper::init_phrase_key_value($phrase);
     }
     return $tmp_phrases;
 }