[Forminator Pro] - Fix hidden field's referer URL

fominator-fix-hidden-field-referer.php

<?php
/**
 * Plugin Name: [Forminator Pro] Fix hidden field's referer URL
 * Description: Fix hidden field's referer URL.
 * Author: Prashant @ WPMUDEV
 * Task: SLS-6326
 * Author URI: https://premium.wpmudev.org
 * License: GPLv2 or later
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly.
}

add_filter( 'forminator_field_hidden_field_value', 'wpmudev_populate_referer_url', 10, 4 );
function wpmudev_populate_referer_url( $value, $saved_value, $field, $hidden_field ) {
	if ( wp_doing_ajax() && 'refer_url' === $saved_value ) {
		$value = sanitize_text_field( $_POST[ $field['element_id'] ] );
	}
	return $value;
}