How to check if ShowMeta('') is empty in Bitrix?

Question

1C-Bitrix

Hello, you need to check if the description meta tag is empty

$APPLICATION->ShowMeta('description');

The usual methods like

if (!empty ($APPLICATION->ShowMeta('description')) )

does not work. How to check for emptiness? Or is it possible in some other way to set the default description to one, and if the field is filled in, then display it accordingly from the field?

Answer 1

To begin with, understand that at the moment of calling ShowMeta you have no data that they are filled. That is, it is NOT GOOD to check for emptiness there!
Check out the following documentation:
1) Delayed Function Mechanism
2) Page Execution Order
After reading it, you will understand that it will not work exactly the way you want. BUT!
You can write your own deferred function with its own behavior and get the desired result.