php templates

[Anon]

the code bellow uses category.php as a template. now, though category.php is a php file it is impossible to use any php code iside it i dont know why. even if i try to echo something it wont show in category.php. what do i do wrong?

if ($catstr > 0){
OpenTemplate("category.php",$error,"index.php3",$cacheext);
}