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Turning Off Reusable Blocks
https://tomjn.com/2021/04/05/turning-off-reusable-blocks/

Turning Off The Block Directory
https://tomjn.com/2021/03/31/turning-off-the-block-directory/

How to Disable the WordPress Block Directory
https://typewheel.xyz/disable-wordpress-block-directory/

Custom previews for ACF Gutenberg Blocks

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INITIALISATION
==============

load wp-config.php
set up default constants
load wp-content/advanced-cache.php if it exists
load wp-content/db.php if it exists
connect to mysql, select db
load object cache (object-cache.php if it exists, or wp-include/cache.php if not)
load wp-content/sunrise.php if it exists (multisite only)

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Caching WordPress data using Transients - Example

In this simple example we create a function for obtaining data from an external source and caching it for 24 hours. You can use the function hd_get_external_data() to get the data and work with it in your site.

If you want to force a refresh of the cache, you can pass a value of true into the function.

You can place the code into your themes functions.php file or better still in a plugin. If you are placing it in a plugin, remember to use function_exists() when using this. This ensures that the code will fail correctly if the plugin is not active.

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<?php 
// PHP memory limit for this site
define( 'WP_MEMORY_LIMIT', '128M' );
define( 'WP_MAX_MEMORY_LIMIT', '256M' ); // Increase admin-side memory limit.

// Database
define( 'WP_ALLOW_REPAIR', true ); // Allow WordPress to automatically repair your database.
define( 'DO_NOT_UPGRADE_GLOBAL_TABLES', true ); // Don't make database upgrades on global tables (like users)

// Explicitely setting url

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// Gallery block
wp.blocks.registerBlockVariation(
	'core/gallery', {
	isDefault: true,
	attributes: {
		linkTo: 'file',
	}
}
);
// Image block

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<?php
/**
 * Add privacy options to the capabilities of all user
 * roles that can edit pages (instead of only admins)
 */
function prefix_manage_privacy_options( $caps, $cap, $user_id, $args ) {
	
	if ( !is_user_logged_in() ) {
		return $caps;
	}

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<?php
/**
 * Use our custom image sizes only for our custom post type
 *
 */
function custom_image_sizes_filter( $sizes ) {

	// Check if a 'post_id' is set and abort otherwise
	if ( !isset( $_REQUEST['post_id'] ) ) {
		return $sizes;