Show admin page, only if function is being used

I don’t see how that would be possible without parsing every template file. I think a better option would be to either output the quote via a filter on something, like the_content, or via a custom action. The former will let you check if a hook has_filter, the latter will let you check if your custom action has anything hooked to it via has_action.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)