$categoryList = array();

    function createBlogPosts($posts) {
        $np = array();

        for($i = count($posts) - 1; $i >= 0; $i--) {
            $bp = new BlogPost;
            $bp->read($posts[$i]);

            $hasFoundCat = False;

            foreach($categoryList as $c) {
                if($bp->category == $c) {
                    $hasFoundCat = True;
                    break;
                }
            }

            if(!$hasFoundCat) {
                array_push($categoryList, $bp->category);
            }

            array_push($np, $bp);
        }

        return $np;
    }