core-bundle/src/Resources/contao/widgets/SectionWizard.php
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 $arrSections;
	}
protected function validator($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;
	}
Standardize the ID

@param mixed $varInput

@return mixed