code: protected static function readPhpFileWithoutTags($strName)
  	{
  		@trigger_error('Using System::readPhpFileWithoutTags() has been deprecated and will no longer work in Contao 5.0. Use the Contao\CoreBundle\Config\Loader\PhpFileLoader instead.', E_USER_DEPRECATED);
  
  		$rootDir = self::getContainer()->getParameter('kernel.project_dir');
  
  		// Convert to absolute path
  		if (strpos($strName, $rootDir . '/') === false)
  		{
  			$strName = $rootDir . '/' . $strName;
  		}
  
  		$loader = new PhpFileLoader();
  
  		return $loader->load($strName);
  	}
docs: Read the contents of a PHP file, stripping the opening and closing PHP tags
  
  @param string $strName The name of the PHP file
  
  @return string The PHP code without the PHP tags
  
  @deprecated Deprecated since Contao 4.0, to be removed in Contao 5.0.
  Use the Contao\CoreBundle\Config\Loader\PhpFileLoader instead.