WordPress: Filter what blocks are allowed where

blocks-allowed.php

<?php

/**
 * Allowed blocks
 * 
 * What blocks are allowed where
 */

/**
 * Allowed core and ACF blocks
 * 
 * See also unregistering of block variations in `modify-core-blocks.js`
 */
function dt_allowed_block_types($allowed_block_types, $block_editor_context)
{

    $post_type = $block_editor_context->post->post_type;

    if (!$post_type) {
        return $allowed_block_types;
    }

    // Blocks that support template widths
    $allowed_block_types_all = [

        // Core
        // 'core/button',
        // 'core/buttons',
        // 'core/embed',
        // 'core-embed/youtube',
        // 'core/heading',
        // 'core/html',
        // 'core/paragraph',
        // 'core/separator',
        // 'core/spacer',

        // ACF
        // 'acf/call-to-action',
        // 'acf/form',
        // 'acf/video-with-placeholder-image',

    ];

    // Blocks that only support narrow templates
    $allowed_block_types_narrow = [

        // Core
        // 'core/gallery',
        // 'core/image',
        // 'core/list',
        // 'core/list-item',
        // 'core/pullquote',
        // 'core/embed',
        // 'core/quote',

        // ACF
        // 'acf/downloads',
        // 'acf/team-members',
        // 'acf/toggle-sections',

    ];

    // Blocks that only support wide templates
    $allowed_block_types_wide = [

        // ACF
        // 'acf/call-to-action',
        // 'acf/hero',
        // 'acf/highlight',
        // 'acf/logos',
        // 'acf/posts',
        // 'acf/panels',
        // 'acf/show-more',

    ];


    // Wide templates
    $post_types_that_support_wide = [
        'page',
        // 'dt_resource',
    ];

    if (in_array($post_type, $post_types_that_support_wide)) {

        if (dt_is_full_width_template($block_editor_context->post->ID)) {

            $allowed_block_types = array_merge(
                $allowed_block_types_all,
                $allowed_block_types_wide
            );
            return $allowed_block_types;

        }
    }

    // Narrow templates
    $allowed_block_types = array_merge(
        $allowed_block_types_all,
        $allowed_block_types_narrow
    );
    return $allowed_block_types;
    
}
// add_filter('allowed_block_types_all', 'dt_allowed_block_types', 10, 2);