Function and usage of get_block_categories() in wordpress


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    The get_block_categories() function in WordPress is designed to retrieve all the categories for block types that are displayed in the block editor. This function plays a crucial role in organizing and managing the block types, making it easier for users to find and use them while editing posts or pages.


    • Purpose: get_block_categories() returns all the categories for block types that will be shown in the block editor.


    • $post_or_block_editor_context (WP_Post | WP_Block_Editor_Context) - This parameter is required. It can be either:
      • A WP_Post object, which represents the current post being edited.
      • A WP_Block_Editor_Context object, which provides context about the block editor environment.

    Return Value:

    • Array[]: The function returns an array of categories for block types. Each category in the array typically includes details like the category's slug, title, and other relevant attributes.

    Sample Usage:

    add_filter( 'block_categories_all', function( $categories, $post_or_context ) {
        if ( $post_or_context instanceof WP_Post ) {
            // Add logic here if needed, for specific post handling
        } elseif ( $post_or_context instanceof WP_Block_Editor_Context ) {
            // Add logic here for general block editor context
        $block_categories = get_block_categories( $post_or_context );
        // You can modify $block_categories here if needed
        return $block_categories;
    }, 10, 2 );

    In this sample usage, the get_block_categories() function is utilized within a filter hook block_categories_all. This hook allows modification of the block categories available in the block editor. The function is called with the $post_or_context parameter, which can be either a post object or a block editor context. Depending on the type of this parameter, different logic can be applied. After retrieving the block categories, they can be modified or used as required before being returned.

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