How to fill in value using php for a hidden field in Birix forms?

Question

1C-Bitrix

I use standard Bitrix forms. The task is to make it visible in the admin panel from which page the form is being filled. I want to create a hidden input and fill in the page title there.
Hidden input made, through the form template. How can I fill it in now? I understand what I can do in JS, but it's more logical to do it in php here. Tell me how?

Answer 1

<input type="hidden" value="<?$APPLICATION->ShowTitle(); ?>" />