Hierarchical taxonomy UI
There is a plugin by Scribu called Category Checklist Tree that disables this “feature”.
hooks
Move excerpt meta box to above content editor
It’s simple, just unregister postexcerpt box first then add another one on the top. Here is my code add_action( ‘admin_menu’, function () { remove_meta_box(‘postexcerpt’, ‘post’, ‘normal’); }, 999 ); add_action(‘edit_form_after_title’, ‘post_excerpt_meta_box’);
How to intercept a 404 error
As was mentioned in a comment, template_redirect would be an appropriate hook for intercepting a 404 before the template is loaded. function wpd_do_stuff_on_404(){ if( is_404() ){ // do stuff } } add_action( ‘template_redirect’, ‘wpd_do_stuff_on_404’ ); Refer to the Action Reference for the general order of actions on the front end. The main query runs between … Read more
How do I implement the WordPress Iris picker into my plugin on the front-end?
This drove me mad for a while, but I got it to work by adding them with the full arguments that are used in the admin script loader rather than just referencing the handle. When I print the $wp_scripts global on the front end, iris and wp-color-picker are nowhere to be found, though all of … Read more
How many times can I hook into the same action?
WordPress hooks work like Hollywood: you don’t call them, they call you. But unlike Hollywood, they keep calling everyone on the list. It’s normal for an action or a filter to have multiple functions hooked to it, from different plugins, or even just different functions in the WordPress core that all do something specific. It … Read more
Hooking in to plugins
@Ryan Elkins: I guess the answer depends on how import each use-case is to you. In some cases it would be something you need quick-and-dirty, in others it might be a more significant use-case. Here are the two things that come to mind: Look for Alternate Hooks within WordPress Core If it’s something quick and … Read more
Changing the “Plugin Activated” Message Default
You can try this: is_admin() && add_filter( ‘gettext’, function( $translated_text, $untranslated_text, $domain ) { $old = array( “Plugin <strong>activated</strong>.”, “Selected plugins <strong>activated</strong>.” ); $new = “Captain: The Core is stable and the Plugin is <strong>activated</strong> at full Warp speed”; if ( in_array( $untranslated_text, $old, true ) ) $translated_text = $new; return $translated_text; } , 99, … Read more
Use wp init hook to call other hooks?
In general: Yes, wait for a dedicated hook to start your own code. Never just throw an object instance into the global namespace. But init is rarely necessary. You hook in as late as possible. If your first code runs on wp_head do not use an earlier hook. You can even cascade hooks: add_action( ‘wp_head’, … Read more
Is there a way to set default custom fields when creating a post?
The action hook save_post is called on save, but i don’t know if you can add metadata at this time. But it should be possible to create/update your meta data after the post was saved with the action hook updated_post_meta. EDIT To pre-select some meta fields (custom fields) on the post creation screen, you have … Read more
get $post in init filter or action?
Turns out the answer was simply to use url_to_postid like this: $keyword = get_post_meta( url_to_postid( “http://”.$_SERVER[‘SERVER_NAME’].$_SERVER[‘REQUEST_URI’] ), ‘_wpg_def_keyword’, true ); Works perfectly even from init.