code: protected function validator($varInput)
  	{
  		$arrTitles = array();
  		$arrIds = array();
  		$arrSections = array();
  
  		foreach ($varInput as $arrSection)
  		{
  			// Title and ID are required
  			if ((!empty($arrSection['title']) && empty($arrSection['id'])) || (empty($arrSection['title']) && !empty($arrSection['id'])))
  			{
  				$this->addError($GLOBALS['TL_LANG']['ERR']['emptyTitleOrId']);
  			}
  
  			// Check for duplicate section titles
  			if (\in_array($arrSection['title'], $arrTitles))
  			{
  				$this->addError(sprintf($GLOBALS['TL_LANG']['ERR']['duplicateSectionTitle'], $arrSection['title']));
  			}
  
  			$arrSection['id'] = StringUtil::standardize($arrSection['id'], true);
  
  			// Add a suffix to reserved names (see #301)
  			if (\in_array($arrSection['id'], array('top', 'wrapper', 'header', 'container', 'main', 'left', 'right', 'footer')))
  			{
  				$arrSection['id'] .= '-custom';
  			}
  
  			// Check for duplicate section IDs
  			if (\in_array($arrSection['id'], $arrIds))
  			{
  				$this->addError(sprintf($GLOBALS['TL_LANG']['ERR']['duplicateSectionId'], $arrSection['id']));
  			}
  
  			$arrTitles[] = $arrSection['title'];
  			$arrIds[] = $arrSection['id'];
  			$arrSections[] = $arrSection;
  		}
  
  		return $arrSections;
  	}
docs: Standardize the ID
  
  @param mixed $varInput
  
  @return mixed