[Forminator] Encode Autofill On Redirection

wpmudev-encode-autofill.php

<?php
/**
 * Plugin Name: [Forminator] Encode Autofill On Redirection
 * Plugin URI: https://premium.wpmudev.org/
 * Description: When your form uses a URL redirection with an autofill field with the & character, the target form won't load the value after the & character. This plugin fixes this problem.
 * Author: Glauber Silva @ WPMUDEV
 * Author URI: https://wpmudev.com/
 * Task: SLS-2236
 * License: GPLv2 or later
 *
 * @package WPMUDEV_Forminator_Encode_Autofill
 */

defined( 'ABSPATH' ) || exit;

if ( ! class_exists( 'WPMUDEV_Forminator_Encode_Autofill' ) ) {

	/**
	 * Main class of the plugin.
	 */
	class WPMUDEV_Forminator_Encode_Autofill {		

		/**
		 * URL Field.
		 *
		 * @var Property
		 */
		private $autofill_field = null;

		/**
		 * Stores the main instance of the class.
		 *
		 * @var Property
		 */
		private static $instance = null;

		/**
		 * Returns the main instance of the class.
		 *
		 * @return WPMUDEV_Forminator_Encode_Autofill
		 */
		public static function get_instance() {

			if ( is_null( self::$instance ) ) {
				self::$instance = new WPMUDEV_Forminator_Encode_Autofill();
			}

			return self::$instance;
		}

		/**
		 * Constructor of the class.
		 */
		private function __construct() {

			$this->init();
		}

		/**
		 * Loads the functions of the class in the apropriete hooks.
		 */
		public function init() {

			add_action( 'forminator_custom_form_submit_field_data', array( $this, 'get_autofill_field' ), 10, 2 );
			add_filter( 'forminator_replace_form_data', array( $this, 'encode_autofill_value' ), 10, 3 );
		}

		/**
		 * Before submitting, check if the form has a field with the forminator-encode-autofill class.
		 */
		public function get_autofill_field( $field_data_array, $form_id ) {

            $custom_form = Forminator_Form_Model::model()->load( $form_id );
            $fields      = $custom_form->get_fields();   
        
            foreach ($fields as $field) {
                if ( isset( $field->raw['custom-class'] ) && 'forminator-encode-autofill' == $field->raw['custom-class'] ) {
                    foreach ($field_data_array as $key => $value) {
                        if ( $field->slug == $value['name'] ) {                            
                            $this->autofill_field = $value['name'];
                        }
                    }
                }
            }
        
            return $field_data_array;
        }

        /**
		 * Replace the default autofill value by an encoded version.
		 */
		public function encode_autofill_value( $content, $data, $fields ) {

            if ( isset( $data[ $this->autofill_field ] ) && strpos( $content, site_url() ) !== false ) {
                $content = str_replace( $data[ $this->autofill_field ], urlencode( $data[ $this->autofill_field ] ), $content );
            }
        
            return $content;
        }	
	}

	add_action(
		'plugins_loaded',
		function() {
			return WPMUDEV_Forminator_Encode_Autofill::get_instance();
		}
	);
}