WordPress - Set default post thumbnail id

my_default_thumbnail_id.php

add_filter('get_post_metadata', 'my_default_thumbnail_id', 100, 4);
function my_default_thumbnail_id($check, $post_id, $key, $single)
{
    if($key == '_thumbnail_id') {
        remove_filter('get_post_metadata', 'my_default_thumbnail_id', 100);
        if(!has_post_thumbnail($post_id) && function_exists('get_field')) {
            $check = get_field('placeholder_image', 'option');
        }
        add_filter('get_post_metadata', 'my_default_thumbnail_id', 100, 4);
        if(!empty($check)) {
            return $check;
        }
    }

    return $check;
}