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You don't have to "include" plugins. Plugins operate, or should operate, by means of the extensive "hook" system built into WordPress core. Once activated, a plugin should not require much else (with …

You've hard-coded the term into the second query. Of course you are seeing the same thing every time: $terms = get_terms( 'model', array( 'orderby' => 'count', 'hide_empty' => 0 ) …

To my knowledge, you can't. The backend is not "theme-able" beyond enqueuing stylesheets and JavaScript. You can make significant changes that way, but the basic structure will stay the same. All yo …

The stock "category" widget uses wp_list_categories() and passes the arguments though widget_categories_args in the process. 716 /** 717 * Filter the arguments for th …

get_month_link() doesn't use any template. It just creates a link to date based archives. The actual template used is decided by a rather complicated template hierarchy system managed by Core. Essenti …

The theme's functions.php file loads first, before any other templates load. You can't pass variables backwards to something that has already loaded. …

You misunderstand what page_template does. It does not create a new template that you will "show up" somewhere and that you can use. It replaces the page.php template provided by the theme. I think …

I don't really know what you mean by "using the Wordpress API in a site as opposed to making it a theme" but I am assuming you mean something like "use the backend but not the front facing stuff". So, …

You need get_categories() with an include argument: if (isset($_GET['cat'])) { $this_category = get_categories( array( 'include' => $_GET['cat'] ) ); var_dump($this_category); } …

I am thinking you probably want get_template_part() to load CPT specific pieces of code. For example (from the Codex): get_template_part( 'nav', 'single' ); // Navigation bar to use in single pages ( …

I would suggest a filter on the_content much like: function conditional_footer_wpse_165930() { if (is_single()) { if (has_category('cat')) { return 'This is the cat footer'; } } } ad …

There are no hooks in the load sequence triggered by get_template_part() that will help you. get_template_part() locate_template load_template And locate_template() is hard-coded to look at theme …

wp_get_themes() returns a WP_Theme object, one of the methods of which, get_stylesheet() will return the value you need to pass to switch_theme() You are not likely to get "the variable" to echo late …

Your code doesn't really do any "user logged in" check, and you aren't using a couple of the globals you import. function restrict_access_to_unlogged_users($template) { if (!is_user_logged_in()) { …

I would suggest that writing files to the theme directory is the wrong way to approach this. You could potentially create multiple duplicate files, which is wasteful of disk space, and it is also poss …