How to get element code in 1c-bitrix of the page on which the user is located in the template of another component?

Question

PHP

The comments component is displayed on the product page in the catalog. The component in the template has the channel parameter, which must correspond to the element code of the catalog element that the user has opened.
How to get this value? Of course, you can take it directly to get the url of the page and get the desired string from it through a regular expression, but this is a crutch.

Answer 1

In element.php insert a call to your comment component and set channel to $ElementID

Answer 2

If you are using a non-complex component, then in the template folder we create component_epilog.php with something like this:
And where needed

$ELEMENT_ID = $APPLICATION->GetPageProperty('ELEMENT_ID');