ACF get fields from Gutenberg block on another post

acf-get-fields-from-another-post.php

<?php
function rmk_get_block_from_post($post_id = null, $block_name =''){

    $all_blocks = parse_blocks(get_the_content('', false, $post_id));

    //handle global blocks
    $ref_blocks = array_filter($all_blocks, function($block){
        return isset($block['attrs']['ref']);
    });

    //expand global blocks
    $expanded_refs = array_map(function($block){
        $global_block_id = $block['attrs']['ref'];
        return parse_blocks(get_the_content('', false, $global_block_id));
    }, $ref_blocks);

    $expanded_ref_blocks = array_values($expanded_refs)[0];

    //put expanded globals in the main block array
    if(!empty($expanded_ref_blocks)):
        $all_blocks = array_merge($all_blocks, $expanded_ref_blocks);
    endif;

    $selected_blocks = array_filter($all_blocks, function($block) use ($block_name){
        return $block['blockName'] == "acf/{$block_name}";
    });    

    if(empty($selected_blocks)) return [];

    $selected_block = array_values($selected_blocks)[0];

    if(!isset($selected_block['attrs']['data'])) return [];
    
    acf_setup_meta( $selected_block['attrs']['data'], $selected_block['attrs']['id'], true );    
    $fields = get_fields();
    
    acf_reset_meta( $selected_block['attrs']['id'] );

    return $fields;
}