path categorized

Hello! I want to change to a specific category (for example id 6) to output a record id of 6 in the code where the records displayed randomly. Please tell me that you need to change it?

switch($user_selected_categorie){
				case 'random':{

					$top_tabs_categorys[$key]['category_name']=__('Random Posts','best-magazine');
					$top_tabs_categorys[$key]['query']='orderby=rand&ignore_sticky_posts=1&posts_per_page='.$count_of_posts;

					break;
				}