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example-captcha.php in Google Captcha 7

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ReCAPTCHA/php/example-captcha.php
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<?php

/**
 * Sample PHP code to use reCAPTCHA V2.
 *
 * @copyright Copyright (c) 2014, Google Inc.
 * @link      http://www.google.com/recaptcha
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
require_once "recaptchalib.php";

// Register API keys at https://www.google.com/recaptcha/admin
$siteKey = "";
$secret = "";

// reCAPTCHA supported 40+ languages listed here: https://developers.google.com/recaptcha/docs/language
$lang = "en";

// The response from reCAPTCHA
$resp = null;

// The error code from reCAPTCHA, if any
$error = null;
$reCaptcha = new ReCaptcha($secret);

// Was there a reCAPTCHA response?
if ($_POST["g-recaptcha-response"]) {
  $resp = $reCaptcha
    ->verifyResponse($_SERVER["REMOTE_ADDR"], $_POST["g-recaptcha-response"]);
}
?>
<html>
  <head><title>reCAPTCHA Example</title></head>
  <body>
<?php

if ($resp != null && $resp->success) {
  echo "You got it!";
}
?>
    <form action="?" method="post">
      <div class="g-recaptcha" data-sitekey="<?php

echo $siteKey;
?>"></div>
      <script type="text/javascript"
          src="https://www.google.com/recaptcha/api.js?hl=<?php

echo $lang;
?>">
      </script>
      <br/>
      <input type="submit" value="submit" />
    </form>
  </body>
</html>