This lesson demonstrates the PHP implementation for registering custom block categories using WordPress filters. You’ll create an editor customizations file to house block editor modifications and use the block_categories_all filter to add your category.
The lesson covers using array_merge() to combine your custom category with existing ones, with order determining placement in the inserter. You’ll learn how to position categories at the top (custom array first) or bottom (custom array last) of the inserter interface.
This approach provides basic control over category positioning while keeping the implementation straightforward.