acf_gutenber_1.php

<?php
add_action('acf/init', 'my_acf_init');
function my_acf_init() {
        
        // sprawdzamy czy funkcja istnieje
        if( function_exists('acf_register_block') ) {
                
                // rejestrujemy blok
                acf_register_block(array(
                        'name'                                => 'testimonial',
                        'title'                                => __('Testimonial'),
                        'description'                => __('A custom testimonial block.'),
                        'render_callback'        => 'my_acf_block_render_callback',
                        'category'                        => 'formatting',
                        'icon'                                => 'admin-comments',
                        'keywords'                => array( 'testimonial', 'quote' ),
                ));
        }
}