This is a utility function that will tell you if the current (or requested) page is the set registration page. This can be useful in various applications where a condition may exist that you want to occur if the current page is or is not the registration page.
(mixed) (optional) Page slug or ID of the page to check. Default: false
Introduced in version 3.1.4
Added default of current page ID in 3.1.7
wpmem_is_reg_page() is located in /inc/api/php.