// somewhere early in your project's loading, require the Composer autoloader
// see: http://getcomposer.org/doc/00-intro.md
require 'vendor/autoload.php';

// disable DOMPDF's internal autoloader if you are using Composer
define('DOMPDF_ENABLE_AUTOLOAD', false);

// include DOMPDF's default configuration
require_once '/path/to/vendor/dompdf/dompdf/dompdf_config.inc.php';