original_string: public static function get_unread_conversations_count($useridto) {
          global $USER, $CFG;
  
          // Check if messaging is enabled.
          if (empty($CFG->messaging)) {
              throw new moodle_exception('disabled', 'message');
          }
  
          $params = self::validate_parameters(
              self::get_unread_conversations_count_parameters(),
              array('useridto' => $useridto)
          );
  
          $context = context_system::instance();
          self::validate_context($context);
  
          $useridto = $params['useridto'];
  
          if (!empty($useridto)) {
              if (core_user::is_real_user($useridto)) {
                  $userto = core_user::get_user($useridto, '*', MUST_EXIST);
              } else {
                  throw new moodle_exception('invaliduser');
              }
          } else {
              $useridto = $USER->id;
          }
  
          // Check if the current user is the receiver or just a privileged user.
          if ($useridto != $USER->id and !has_capability('moodle/site:readallmessages', $context)) {
              throw new moodle_exception('accessdenied', 'admin');
          }
  
          return \core_message\api::count_unread_conversations($userto);
      }
code: public static function get_unread_conversations_count($useridto) {
          global $USER, $CFG;
  
          // Check if messaging is enabled.
          if (empty($CFG->messaging)) {
              throw new moodle_exception('disabled', 'message');
          }
  
          $params = self::validate_parameters(
              self::get_unread_conversations_count_parameters(),
              array('useridto' => $useridto)
          );
  
          $context = context_system::instance();
          self::validate_context($context);
  
          $useridto = $params['useridto'];
  
          if (!empty($useridto)) {
              if (core_user::is_real_user($useridto)) {
                  $userto = core_user::get_user($useridto, '*', MUST_EXIST);
              } else {
                  throw new moodle_exception('invaliduser');
              }
          } else {
              $useridto = $USER->id;
          }
  
          // Check if the current user is the receiver or just a privileged user.
          if ($useridto != $USER->id and !has_capability('moodle/site:readallmessages', $context)) {
              throw new moodle_exception('accessdenied', 'admin');
          }
  
          return \core_message\api::count_unread_conversations($userto);
      }
code_tokens: public static function get_unread_conversations_count ( $ useridto ) { global $ USER , $ CFG ; // Check if messaging is enabled. if ( empty ( $ CFG -> messaging ) ) { throw new moodle_exception ( 'disabled' , 'message' ) ; } $ params = self :: validate_parameters ( self :: get_unread_conversations_count_parameters ( ) , array ( 'useridto' => $ useridto ) ) ; $ context = context_system :: instance ( ) ; self :: validate_context ( $ context ) ; $ useridto = $ params [ 'useridto' ] ; if ( ! empty ( $ useridto ) ) { if ( core_user :: is_real_user ( $ useridto ) ) { $ userto = core_user :: get_user ( $ useridto , '*' , MUST_EXIST ) ; } else { throw new moodle_exception ( 'invaliduser' ) ; } } else { $ useridto = $ USER -> id ; } // Check if the current user is the receiver or just a privileged user. if ( $ useridto != $ USER -> id and ! has_capability ( 'moodle/site:readallmessages' , $ context ) ) { throw new moodle_exception ( 'accessdenied' , 'admin' ) ; } return \ core_message \ api :: count_unread_conversations ( $ userto ) ; }
docstring: Get unread messages count function.
  
  @since  3.2
  @throws invalid_parameter_exception
  @throws moodle_exception
  @param  int      $useridto       the user id who received the message
  @return external_description
docstring_tokens: Get unread messages count function .