Problem with Pages (not posts)

hello,

if i have a page(not post) on my site (named “WORD”),
i want the function to understand that value.

i use
$var = word; ///not a double quotation;
$var = strtoupper($var);
$_GET[‘page_id’]=$var;
but it doesn’t work. if my site has a page “word” (with lowercase), than the function works. but i want

to get the uppercase value. i need this..

strtoupper(word); gives you = WORD,
but the whole function, which has
$_GET[‘page_id’]=strtoupper(word);
can’t find the page named mysite.com/WORD, but it searches again for the page mystie.com/word” (with

lowercase).
everything works well for posts, but i want for pages..