This code snippet below shows the list of all Joomla user groups(registered,editor.superuser and ...) at component

    // load in joomla user groups
    $qry = "SELECT * FROM #__usergroups ORDER BY lft";
    $db->setQuery($qry);
    
    $this->groups = $db->loadObjectList();
    
    $group_index = array();
    
    foreach ($this->groups as &$group)
    {
        $group_index[$group->id] = &$group;
        
        if ($group->parent_id == 0)
        {
            $group->level = 0;  
        } else {
            $group->level = $group_index[$group->parent_id]->level + 1;
        }
        
        $group->display = str_repeat("- ", $group->level) . $group->title;
    }
    
    array_unshift($this->groups, JHTML::_('select.option', '', JText::_("JOOMLA_USERGROUP"), 'id', 'display'));
    $this->jgroup_select = JHTML::_('select.genericlist',  $this->groups, 'usergroup', 'class="inputbox" size="1" onchange="document.fssForm.submit( );"', 'id', 'display', $this->usergroup);

now I want to show just registered user and manager user list or just registered user

This code snippet below shows the list of all Joomla user groups(registered,editor.superuser and ...) at component

    // load in joomla user groups
    $qry = "SELECT * FROM #__usergroups ORDER BY lft";
    $db->setQuery($qry);
    
    $this->groups = $db->loadObjectList();
    
    $group_index = array();
    
    foreach ($this->groups as &$group)
    {
        $group_index[$group->id] = &$group;
        
        if ($group->parent_id == 0)
        {
            $group->level = 0;  
        } else {
            $group->level = $group_index[$group->parent_id]->level + 1;
        }
        
        $group->display = str_repeat("- ", $group->level) . $group->title;
    }
    
    array_unshift($this->groups, JHTML::_('select.option', '', JText::_("JOOMLA_USERGROUP"), 'id', 'display'));
    $this->jgroup_select = JHTML::_('select.genericlist',  $this->groups, 'usergroup', 'class="inputbox" size="1" onchange="document.fssForm.submit( );"', 'id', 'display', $this->usergroup);

now I want to show only registered user and manager user list or only registered user