core-bundle/src/Resources/contao/library/Contao/Controller.php
protected static function replaceOldBePaths($strContext)
	{
		$router = System::getContainer()->get('router');

		$generate = function ($route) use ($router)
		{
			return substr($router->generate($route), \strlen(Environment::get('path')) + 1);
		};

		$arrMapper = array
		(
			'contao/confirm.php'   => $generate('contao_backend_confirm'),
			'contao/file.php'      => $generate('contao_backend_file'),
			'contao/help.php'      => $generate('contao_backend_help'),
			'contao/index.php'     => $generate('contao_backend_login'),
			'contao/main.php'      => $generate('contao_backend'),
			'contao/page.php'      => $generate('contao_backend_page'),
			'contao/password.php'  => $generate('contao_backend_password'),
			'contao/popup.php'     => $generate('contao_backend_popup'),
			'contao/preview.php'   => $generate('contao_backend_preview'),
			'contao/switch.php'    => $generate('contao_backend_switch')
		);

		return str_replace(array_keys($arrMapper), $arrMapper, $strContext);
	}
protected static function replaceOldBePaths($strContext)
	{
		$router = System::getContainer()->get('router');

		$generate = function ($route) use ($router)
		{
			return substr($router->generate($route), \strlen(Environment::get('path')) + 1);
		};

		$arrMapper = array
		(
			'contao/confirm.php'   => $generate('contao_backend_confirm'),
			'contao/file.php'      => $generate('contao_backend_file'),
			'contao/help.php'      => $generate('contao_backend_help'),
			'contao/index.php'     => $generate('contao_backend_login'),
			'contao/main.php'      => $generate('contao_backend'),
			'contao/page.php'      => $generate('contao_backend_page'),
			'contao/password.php'  => $generate('contao_backend_password'),
			'contao/popup.php'     => $generate('contao_backend_popup'),
			'contao/preview.php'   => $generate('contao_backend_preview'),
			'contao/switch.php'    => $generate('contao_backend_switch')
		);

		return str_replace(array_keys($arrMapper), $arrMapper, $strContext);
	}
Replace the old back end paths

@param string $strContext The context

@return string The modified context