+1 to both of the other answers, for explaining the primary differences between actions and filters. However, to answer your specific question, about which to use for modifying a query: Injecting your custom query into the template does, as you guessed, require hooking into an existing action. (Whether or not wp_footer is the correct/ideal action … Read more
If you don’t care about the actual action you can use login_init action like this: add_action( ‘login_init’, ‘wpse8170_login_init’ ); function wpse8170_login_init() { // do your stuff here } But if you want to handle only special actions, then you need to hook into login_form_{action} action, like this: add_action( ‘login_form_login’, ‘wpse8170_login_form_login’ ); function wpse8170_login_form_login() { // … Read more
Know which file call a filter or an action is not possible running code, you have to search and read the source code or use some documentation. There are different plugins that help you to debug the hook being fired in a page, search codex and/or Google for them. However, to have a quick idea, … Read more
It’s actually pretty simple to change the title in content-product.php, but you won’t be able to do it with a hook. Near the top of the file, you should see this line: Override this template by copying it to yourtheme/woocommerce/content-product.php All you have to do is copy the file to the above directory, replacing “yourtheme” … Read more
Like so: INSERT INTO $mytable (post_id) SELECT ID FROM $wpdb->posts as posts LEFT JOIN $mytable as dup_check ON dup_check.post_id = posts.ID WHERE dup_check.post_id IS NULL;
I was hunting for a way to do this, and no-one seems to mention the wp_editor_settings filter. This worked for me: function my_editor_settings($settings) { $settings[‘quicktags’] = false; return $settings; } add_filter(‘wp_editor_settings’, ‘my_editor_settings’);
I found out by accident recently that all the notices will be moved to after the first <h2> tag on the page inside a <div class=”wrap”>. This gives you some slight control in that, for example, on a plugin settings page you can put an empty <h2></h2> at the very top if you want to … Read more
WordPress can not load scripts after init hook. PluginBoilerplate is missing the correct handling process for those kind of usage. This OOP WP Plugin Boilerplate do it much better, and provide loader classes for admin and client.
Right now there are no hooks to do that from a plugin and the function that makes the search query itself is not pluggable which means that the only way to achieve that is to hack core files. Currently there is an open Trac Ticket asking for some kind of hook.
This is untested, but I think you can just define wp_handle_upload_error in your functions.php file and return custom error messages. If you look at where that function is defined in that file, if ( ! function_exists( ‘wp_handle_upload_error’ ) ) { function wp_handle_upload_error( &$file, $message ) { return array( ‘error’=>$message ); } } You can see … Read more