How to use functions that are declared in snippets in Evolution CMS (Modx) in an external PHP Script?

php modx evolution-cms

PHP Snippet 1:

// Modx init
require_once 'config.core.php';
require_once MODX_CORE_PATH.'model/modx/modx.class.php';
$modx = new modX();
$modx->initialize('mgr');

// Run snippet
$modx->runSnippet('functions_main');

// Run your functions here