Oh good lord.... lol.. The "proper" way.
Code:
if( !isset($page) || $page !== true ){
That assumes that $page will contain a proper php boolean type.. And yes, the extra = is not a typo because it doesn't just check the value but also the "type". However, if it's a 0/1 then it should just be
Code:
if( !isset($page) || $page != 1 ){