Typo3 checkbox group handling

PageBansViewHelper.php

<?php 
namespace BinaryBay\BbBoilerplate\ViewHelpers;

class PageBansViewHelper extends \TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper {

	/**
	 * @var array
	 */
	const PAGE_BAN_FIELD = 'page_ban';

	/**
	 * Return bans incons array classes
	 * @return array
	 */
	public function render() {
		$icons = array();
		$banFields = $GLOBALS['TCA']['pages']['columns'][self::PAGE_BAN_FIELD]['config']['items'];
		$page = $GLOBALS['TSFE']->page;

		if (!array_key_exists(self::PAGE_BAN_FIELD, $page)) {
			throw new \TYPO3\CMS\Fluid\Exception('Page property "'.self::PAGE_BAN_FIELD.'" does not exist. Update your database!', 1459866635);
		}

		$pageBanVal = $page[self::PAGE_BAN_FIELD];
		$pageBanBinaryArr = array_reverse(str_split(decbin($pageBanVal)));
		
		foreach ($pageBanBinaryArr as $key => $isOn) {
			if ($isOn === '1') {
				$icons[] = $banFields[$key][1];
			}
		}

		return $icons;
	}
}