original_string: public static function get_messages($userid, $otheruserid, $limitfrom = 0, $limitnum = 0,
              $sort = 'timecreated ASC', $timefrom = 0, $timeto = 0) {
  
          if (!empty($timefrom)) {
              // Get the conversation between userid and otheruserid.
              $userids = [$userid, $otheruserid];
              if (!$conversationid = self::get_conversation_between_users($userids)) {
                  // This method was always used for individual conversations.
                  $conversation = self::create_conversation(self::MESSAGE_CONVERSATION_TYPE_INDIVIDUAL, $userids);
                  $conversationid = $conversation->id;
              }
  
              // Check the cache to see if we even need to do a DB query.
              $cache = \cache::make('core', 'message_time_last_message_between_users');
              $key = helper::get_last_message_time_created_cache_key($conversationid);
              $lastcreated = $cache->get($key);
  
              // The last known message time is earlier than the one being requested so we can
              // just return an empty result set rather than having to query the DB.
              if ($lastcreated && $lastcreated < $timefrom) {
                  return [];
              }
          }
  
          $arrmessages = array();
          if ($messages = helper::get_messages($userid, $otheruserid, 0, $limitfrom, $limitnum,
                                               $sort, $timefrom, $timeto)) {
              $arrmessages = helper::create_messages($userid, $messages);
          }
  
          return $arrmessages;
      }
code: public static function get_messages($userid, $otheruserid, $limitfrom = 0, $limitnum = 0,
              $sort = 'timecreated ASC', $timefrom = 0, $timeto = 0) {
  
          if (!empty($timefrom)) {
              // Get the conversation between userid and otheruserid.
              $userids = [$userid, $otheruserid];
              if (!$conversationid = self::get_conversation_between_users($userids)) {
                  // This method was always used for individual conversations.
                  $conversation = self::create_conversation(self::MESSAGE_CONVERSATION_TYPE_INDIVIDUAL, $userids);
                  $conversationid = $conversation->id;
              }
  
              // Check the cache to see if we even need to do a DB query.
              $cache = \cache::make('core', 'message_time_last_message_between_users');
              $key = helper::get_last_message_time_created_cache_key($conversationid);
              $lastcreated = $cache->get($key);
  
              // The last known message time is earlier than the one being requested so we can
              // just return an empty result set rather than having to query the DB.
              if ($lastcreated && $lastcreated < $timefrom) {
                  return [];
              }
          }
  
          $arrmessages = array();
          if ($messages = helper::get_messages($userid, $otheruserid, 0, $limitfrom, $limitnum,
                                               $sort, $timefrom, $timeto)) {
              $arrmessages = helper::create_messages($userid, $messages);
          }
  
          return $arrmessages;
      }
code_tokens: public static function get_messages ( $ userid , $ otheruserid , $ limitfrom = 0 , $ limitnum = 0 , $ sort = 'timecreated ASC' , $ timefrom = 0 , $ timeto = 0 ) { if ( ! empty ( $ timefrom ) ) { // Get the conversation between userid and otheruserid. $ userids = [ $ userid , $ otheruserid ] ; if ( ! $ conversationid = self :: get_conversation_between_users ( $ userids ) ) { // This method was always used for individual conversations. $ conversation = self :: create_conversation ( self :: MESSAGE_CONVERSATION_TYPE_INDIVIDUAL , $ userids ) ; $ conversationid = $ conversation -> id ; } // Check the cache to see if we even need to do a DB query. $ cache = \ cache :: make ( 'core' , 'message_time_last_message_between_users' ) ; $ key = helper :: get_last_message_time_created_cache_key ( $ conversationid ) ; $ lastcreated = $ cache -> get ( $ key ) ; // The last known message time is earlier than the one being requested so we can // just return an empty result set rather than having to query the DB. if ( $ lastcreated && $ lastcreated < $ timefrom ) { return [ ] ; } } $ arrmessages = array ( ) ; if ( $ messages = helper :: get_messages ( $ userid , $ otheruserid , 0 , $ limitfrom , $ limitnum , $ sort , $ timefrom , $ timeto ) ) { $ arrmessages = helper :: create_messages ( $ userid , $ messages ) ; } return $ arrmessages ; }
docstring: Returns the messages to display in the message area.
  
  TODO: This function should be removed once the related web service goes through final deprecation.
  The related web service is data_for_messagearea_messages.
  Followup: MDL-63261
  
  @param int $userid the current user
  @param int $otheruserid the other user
  @param int $limitfrom
  @param int $limitnum
  @param string $sort
  @param int $timefrom the time from the message being sent
  @param int $timeto the time up until the message being sent
  @return array
docstring_tokens: Returns the messages to display in the message area .