discuz! What is the PHP file that parses head.htm, and what should I do with it?

discuz! What is the PHP file that parses head.htm?
Because you want to do the portal navigation, you need to add each list page, and the navigation needs this array:
$res =db::fetch_all ("SELECT * from%t", Array (' portal_category '));
I added this code to the portal_index.php, but don't forget that there are other list pages, and if you don't add this code, the navigation won't appear on the other list pages.
But how each page is added, can be, that code repeats too much, if there is to have a parsing head htm php file is good, I do not know which, or in other ways can solve it?
------to solve the idea----------------------
This also can, as long as can be obtained, there is no wild way, two times development is to change the code of others, first to achieve, and then optimize

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