[Forminator Pro] - Shortcode attribute in hidden field

forminator-shortcode-atribute-hidden.php

<?php
/**
 * Plugin Name: [Forminator Pro] Shortcode attribute in hidden field.
 * Description: Renders shortcode attribute in hidden field value.
 * Author: Prashant @ WPMUDEV
 * Author URI: https://premium.wpmudev.org
 * License: GPLv2 or later
 */

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

add_action( 'forminator_custom_form_submit_before_set_fields', 'wpmudev_change_hidden_field_data_attr', 10, 3 );
function wpmudev_change_hidden_field_data_attr( $entry, $module_id, $field_data_array ) {
	$form_ids = array( 2960 ); // Please change the form ID.
	if ( ! in_array( intval( $module_id ), $form_ids, true ) ) {
		return;
	}

	foreach ( $field_data_array as $key => $value ) {
		if ( 'hidden-1' === $value['name'] ) { // Please change the field ID.
			Forminator_CForm_Front_Action::$info['field_data_array'][ $key ]['value'] = sanitize_text_field( $_POST[ $value['name'] ] );
		}
	}
}

add_action( 'forminator_before_form_render', 'wpmudev_hidden_field_render_shortcode_attr', 10, 1 );
function wpmudev_hidden_field_render_shortcode_attr( $id ) {
	if ( 2960 !== intval( $id ) ) { // Please change the form ID.
		return;
	}

	add_filter( 'forminator_field_hidden_field_value', 'wpmudev_populate_shortcode_hidden_field', 10, 4 );
}

function wpmudev_populate_shortcode_hidden_field( $value, $saved_value, $field, $hidden_field ) {
	if ( 'hidden-1' === $field['element_id'] ) { // Please change the field ID.
		$data = array();
		preg_match( '/\[forminator_form (.+?)\]/', get_the_content(), $data );

		$data   = array_pop( $data );
		$data   = explode( ' ', $data );
		$params = array();

		foreach ( $data as $d ) {
			list( $opt, $val ) = explode( "=", $d );
			$params[ $opt ]    = trim( $val, '"' );
		}

		if ( ! empty( $params['x'] ) ) {
			$value = sanitize_text_field( $params['x'] );
		}
	}

	return $value;
}