Page Cache

[bluevogue]

Tried searching the forum for anything regarding this but to no avail..

 

I wanted to use this contribution but whenever I paste the code below I get an error message in the browser when loading the site saying something like ?call to undefined xxx !tep_session_is_registered in xxxx?

 

 

if (!tep_session_is_registered('customer_id') && ENABLE_PAGE_CACHE == 'true' && class_exists('page_cache') ) {

echo "<%CART_CACHE%>";

} else {

require(DIR_WS_BOXES . 'shopping_cart.php');

}

 

Appreciate any help you can give me on this!

 

Thanks