function my_acf_save__posts( $post_id ) {

    // get the user name field
    $first_name = get_field('twoje_imie', $post_id);

   	$email = get_field('twoj_email', $post_id);

   	$pass = wp_generate_password();

    // create the user
    $create = wp_create_user( $email, $pass, $email );



    if ((is_wp_error($create) || isset($_COOKIE['konkurs'])) && !current_user_can('manage_options')) {
    	wp_delete_post($post_id);
    	echo "Już dodałeś prace";
    	exit;
    }

    $user = get_user_by_email($email);
    wp_update_user(['ID'=>$user->ID, 'first_name' => $first_name]);
    update_user_meta($user->ID, 'post_created', 1);

    wp_new_user_notification($user->ID);
    // delete the unused post



    $arg = array(
    'ID' => $post_id,
    'post_author' => $user->ID,
);
	wp_update_post( $arg );




}