What is WordPress Hook: postbox_classes_{$screen_id}_{$box_id}
The postbox_classes_{$screen_id}_{$box_id} hook in WordPress is used to add custom classes to specific postboxes within the admin interface. This allows developers to modify the appearance and behavior of individual postboxes based on the screen and box ID.
Understanding the Hook: postbox_classes_{$screen_id}_{$box_id}
This hook is located within the postbox_classes() function in the /wp-admin/includes/template.php file. It is called when generating the classes for a specific postbox, allowing developers to modify the classes before they are output.
Hook Parameters (if applicable): postbox_classes_{$screen_id}_{$box_id}
The postbox_classes_{$screen_id}_{$box_id} hook does not accept any arguments or parameters.
Hook Doesn’t Work: postbox_classes_{$screen_id}_{$box_id}
If the postbox_classes_{$screen_id}_{$box_id} hook doesn’t seem to be working, it could be due to a typo in the hook name or an issue with the function where it is being used. Double-check the hook name and ensure that it is being called in the correct location within the code.
Best Practices & Usage Notes (if applicable): postbox_classes_{$screen_id}_{$box_id}
When using the postbox_classes_{$screen_id}_{$box_id} hook, it’s important to note that it is specific to the admin interface and should only be used for modifying postboxes within that context. Additionally, it’s best practice to only add necessary classes to avoid bloating the HTML output.
Usage Example: postbox_classes_{$screen_id}_{$box_id}
“`php
function custom_postbox_classes( $classes, $screen_id, $box_id ) {
if ( $screen_id === ‘dashboard’ && $box_id === ‘custom-box’ ) {
$classes[] = ‘custom-dashboard-box’;
}
return $classes;
}
add_filter( ‘postbox_classes_dashboard_custom-box’, ‘custom_postbox_classes’, 10, 3 );
“`
