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Edit File: RequestParameters.php

<?php
/**
 * This is a PHP library that handles calling reCAPTCHA.
 *
 * BSD 3-Clause License
 * @copyright (c) 2019, Google Inc.
 * @link https://www.google.com/recaptcha
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

namespace ReCaptcha;

/**
 * Stores and formats the parameters for the request to the reCAPTCHA service.
 */
class RequestParameters
{
    /**
     * The shared key between your site and reCAPTCHA.
     * @var string
     */
    private $secret;

/**
     * The user response token provided by reCAPTCHA, verifying the user on your site.
     * @var string
     */
    private $response;

/**
     * Remote user's IP address.
     * @var string
     */
    private $remoteIp;

/**
     * Client version.
     * @var string
     */
    private $version;

/**
     * Initialise parameters.
     *
     * @param string $secret Site secret.
     * @param string $response Value from g-captcha-response form field.
     * @param string $remoteIp User's IP address.
     * @param string $version Version of this client library.
     */
    public function __construct($secret, $response, $remoteIp = null, $version = null)
    {
        $this->secret = $secret;
        $this->response = $response;
        $this->remoteIp = $remoteIp;
        $this->version = $version;
    }

/**
     * Array representation.
     *
     * @return array Array formatted parameters.
     */
    public function toArray()
    {
        $params = array('secret' => $this->secret, 'response' => $this->response);

if (!is_null($this->remoteIp)) {
            $params['remoteip'] = $this->remoteIp;
        }

if (!is_null($this->version)) {
            $params['version'] = $this->version;
        }

return $params;
    }

/**
     * Query string representation for HTTP request.
     *
     * @return string Query string formatted parameters.
     */
    public function toQueryString()
    {
        return http_build_query($this->toArray(), '', '&');
    }
}