Disable/Allow core Gutenberg Blocks

allowed-blocks.php

<?php
/**
 * Modify the available blocks for the Gutenberg editor
 *
 */

namespace Theme\Theme\Blocks;

use \WP_Block_Type_Registry;

/**
 * Filter the allowed blocks for the block editor
 *
 * @param array $allowed_block_types Current list of allowed blocks.
 * @return array Filtered list of allowed blocks
 */
function allowed_blocks( $allowed_block_types ) {
	$core_blocks_to_keep = array(
    		'core/freeform',
		'core/paragraph',
		'core/heading',
		'core/list',
		'core/image',
		'core/table',
		'core/separator',
		'core/gallery',
		'core/embed',
	);

	// Find the currently registered blocks
	// The value being filtered can either be a boolean or an array.
	$currently_allowed_blocks = is_array( $allowed_block_types ) ? $allowed_block_types : array();

	// If we have a true boolean type, then all blocks are permitted.
	if ( true === $allowed_block_types ) {
		$registry = WP_Block_Type_Registry::get_instance();
		// See: https://developer.wordpress.org/reference/classes/wp_block_type_registry/get_all_registered/
		$currently_allowed_blocks = array_keys( $registry->get_all_registered() );
	}

	// Include all ACF blocks
	$custom_allowed_blocks = array_values(
		array_filter(
			$currently_allowed_blocks,
			function( $block_type ) {
				return strpos( $block_type, 'acf/' ) === 0;
			}
		)
	);

	return array_merge( $core_blocks_to_keep, $custom_allowed_blocks );
}

// Filter changed at WordPress 5.8.
// See https://developer.wordpress.org/block-editor/reference-guides/filters/block-filters/#allowed_block_types_all
$block_filter_name = class_exists( 'WP_Block_Editor_Context' ) ? 'allowed_block_types_all' : 'allowed_block_types';
add_filter( $block_filter_name, __NAMESPACE__ . '\allowed_blocks', 99, 1 );

/**
 * Remove 'core-block-patterns' from theme support to avoid cluttering the editor.
 */
function disable_core_block_patterns() {
	remove_theme_support( 'core-block-patterns' );
}
add_action( 'after_setup_theme', __NAMESPACE__ . '\disable_core_block_patterns', 10, 0 );