core-bundle/src/Resources/contao/dca/tl_user_group.php
public function getExcludedFields()
	{
		$processed = array();

		/** @var SplFileInfo[] $files */
		$files = Contao\System::getContainer()->get('contao.resource_finder')->findIn('dca')->depth(0)->files()->name('*.php');

		foreach ($files as $file)
		{
			if (\in_array($file->getBasename(), $processed))
			{
				continue;
			}

			$processed[] = $file->getBasename();

			$strTable = $file->getBasename('.php');

			Contao\System::loadLanguageFile($strTable);
			$this->loadDataContainer($strTable);
		}

		$arrReturn = array();

		// Get all excluded fields
		foreach ($GLOBALS['TL_DCA'] as $k=>$v)
		{
			if (\is_array($v['fields']))
			{
				foreach ($v['fields'] as $kk=>$vv)
				{
					// Hide the "admin" field if the user is not an admin (see #184)
					if ($k == 'tl_user' && $kk == 'admin' && !$this->User->isAdmin)
					{
						continue;
					}

					if ($vv['exclude'] || $vv['orig_exclude'])
					{
						$arrReturn[$k][Contao\StringUtil::specialchars($k.'::'.$kk)] = isset($vv['label'][0]) ? $vv['label'][0] . ' <span style="color:#999;padding-left:3px">[' . $kk . ']</span>' : $kk;
					}
				}
			}
		}

		ksort($arrReturn);

		return $arrReturn;
	}
public function getExcludedFields()
	{
		$processed = array();

		/** @var SplFileInfo[] $files */
		$files = Contao\System::getContainer()->get('contao.resource_finder')->findIn('dca')->depth(0)->files()->name('*.php');

		foreach ($files as $file)
		{
			if (\in_array($file->getBasename(), $processed))
			{
				continue;
			}

			$processed[] = $file->getBasename();

			$strTable = $file->getBasename('.php');

			Contao\System::loadLanguageFile($strTable);
			$this->loadDataContainer($strTable);
		}

		$arrReturn = array();

		// Get all excluded fields
		foreach ($GLOBALS['TL_DCA'] as $k=>$v)
		{
			if (\is_array($v['fields']))
			{
				foreach ($v['fields'] as $kk=>$vv)
				{
					// Hide the "admin" field if the user is not an admin (see #184)
					if ($k == 'tl_user' && $kk == 'admin' && !$this->User->isAdmin)
					{
						continue;
					}

					if ($vv['exclude'] || $vv['orig_exclude'])
					{
						$arrReturn[$k][Contao\StringUtil::specialchars($k.'::'.$kk)] = isset($vv['label'][0]) ? $vv['label'][0] . ' <span style="color:#999;padding-left:3px">[' . $kk . ']</span>' : $kk;
					}
				}
			}
		}

		ksort($arrReturn);

		return $arrReturn;
	}
Return all excluded fields as HTML drop down menu

@return array