I would start with this question: Is the functionality related to presentation of content, or with generation/management of content, or of the site, or of the user identity? If the functionality is not related specifically to presentation of content, then it is squarely within Plugin Territory. This list is long: Modifying core WP filters (wp_head … Read more
Good question, there are a number of approaches and it depends on what you want to achieve. I often do; add_action( ‘plugins_loaded’, array( ‘someClassy’, ‘init’ )); class someClassy { public static function init() { $class = __CLASS__; new $class; } public function __construct() { //construct what you see fit here… } //etc… } A more … Read more
There are three different hooks. They trigger in the following cases: Uninstall Deactivation Activation How-to trigger functions safely during the scenarios The following shows the right ways to safely hook callback functions that get triggered during the mentioned actions. As you could use this code in a plugin that uses plain functions, a class or … Read more
You can make the ‘slug’ for the submenu page equal that of the top level page, and they’ll point to the same place: add_action(‘admin_menu’, ‘my_menu_pages’); function my_menu_pages(){ add_menu_page(‘My Page Title’, ‘My Menu Title’, ‘manage_options’, ‘my-menu’, ‘my_menu_output’ ); add_submenu_page(‘my-menu’, ‘Submenu Page Title’, ‘Whatever You Want’, ‘manage_options’, ‘my-menu’ ); add_submenu_page(‘my-menu’, ‘Submenu Page Title2’, ‘Whatever You Want2’, ‘manage_options’, … Read more
Use Actions and Filters If you think people would like to add or alter some data: provide apply_filters() before returning. P.S. One thing I find a bit disappointing and that your question addresses is the percentage of plugins that are designed only for end-users, i.e. that have no hooks of their own. Imagine if WordPress … Read more