PHP error. What am I doing wrong?

Question

PHP

I can't figure out what I'm doing wrong. There is such an error joxi.ru/KAgYZPai0lLVml At the address indicated in the error, I did not find get_currentuserinfo to fix wp_get_current_user(). But I found get_currentuserinfo in the header and fixed it, but the error still hangs ..
Also, can you tell me how else you can check the site for errors? The bottom line is that there is a large white space under the footer, but it's not css, I realized that the problem is most likely in woocommerce, because when I turn it off, the space goes away.

Answer 1

use search and autocorrect

Answer 2

wp-includes? Are you trying to change functions in the kernel?
- What version of WordPress do you have?
- Why are you fighting with Notice? It's not an error, it's just a notice.
- Space under the footer? Is there a link to the site?