assign-new-user.php

<?php

/**
** Script to assign post to new user when Post Data field and user registration are used together. 
**/


if (!defined('ABSPATH'))
{
    exit;
}
elseif (defined('WP_CLI') && WP_CLI)
{
    return;
}

add_action( 'plugins_loaded', 'wpmudev_assing_new_post_to_new_user_id', 100 );
function wpmudev_assing_new_post_to_new_user_id() {
    if ( class_exists( 'Forminator' ) ) {
        class WPMUDEV_Dynamically_assign_id {
            private $new_post;

            public function __construct() {
                add_filter( 'forminator_cform_user_registered', array( $this, 'handle_user_id' ) , 10, 1 );
                add_action( 'forminator_post_data_field_post_saved', array( $this, 'post_update_handler' ) , 20, 1 );
            }

            public function handle_user_id( $user_id ) {
				$post_id = $this->new_post;
				if( ! empty( $post_id ) ) {
					$postarr = ['ID' => $post_id, 'post_author' => $user_id ];
					wp_update_post($postarr);
				}
            }

            public function post_update_handler( $post_id ) {
				$this->new_post = $post_id;
            }

        }

        $run = new WPMUDEV_Dynamically_assign_id;
    }
}