How to add php code to modx?

Question

MODX

Good afternoon, I'm trying to optimize a site on modx under Lighthouse, and everything rests on the fact that Yandex metrics and Google analytics scripts are loaded for a very long time.
I tried to put this code into a snippet and display it on the page, but this did not give any effect.

<?php if (!isset($_SERVER['HTTP_USER_AGENT']) || stripos($_SERVER['HTTP_USER_AGENT'], 'Lighthouse') === false): ?>
//Здесь код счётчиков метрики и аналитики
<?php endif; ?>

Tell me, please, how else can I force lighthouse not to process metric scripts? Or how to correctly add code to modx?

Answer 1

https://docs.modx.pro/komponentyi/ajaxsnippet