google-captcha.php

/*
Version 1.
*/
private function validateCaptcha()
	{
		require_once './library/google/1.11/recaptchalib.php';
		
		if (!$_POST["recaptcha_challenge_field"]) {
			return new View('agency', array("messageFailed" => "formCaptchaErrorMessage"));
		}
		$secret = "6LfkVhETAAAAAK0sorKTrEQZVkjowXA2Xmp8MsCr";
		$response = null;
		$response = recaptcha_check_answer($secret, $_SERVER['REMOTE_ADDR'], $_POST['recaptcha_challenge_field'], $_POST['recaptcha_response_field'] );
		return $response;
	}
	
	
/****************************************
v2
****************************************/

view side :
<script src='https://www.google.com/recaptcha/api.js?hl=<?php echo L::lang; ?>'></script>
    
 <div class="form-group">
        <div class="col-sm-3">
            <div class="g-recaptcha-response">
            </div>
        </div>
        <div class="col-sm-8">
            <div class="g-recaptcha" data-sitekey="6LfkVhETAAAAAFSqhyycpfcJNrd_UpGyMoiQbrGI"></div>
        </div>
    </div>
</form>


server side:
private function validateCaptcha()
  {
        require_once './library/google/recaptchalib.php';
          if (!$_POST["g-recaptcha-response"]) {
                return new View('agency', array("messageFailed" => "formCaptchaErrorMessage"));
            }
            $secret = "6LfkVhETAAAAAK0sorKTrEQZVkjowXA2Xmp8MsCr";
            $response = null;
            $reCaptcha = new ReCaptcha($secret);
            $response = $reCaptcha->verifyResponse($_SERVER["REMOTE_ADDR"], $_POST["g-recaptcha-response"]);
            return $response
  }