I use Joomla 3.4.1 and Recaptcha v 2.0. I can't validate the captcha, i'm sure i've the good PHP code..

This is the code in plugin file, recaptcha.php :

function onCheckAnswer($code = null)[...]
   case '2.0':
      // Challenge Not needed in 2.0 but needed for getResponse call
      $challenge = null;
      $response  = $input->get('g-recaptcha-response', '', 'string');
      echo "response :<br>";
      $spam      = ($response == null || strlen($response) == 0);
      echo "spam :<br>";

PHP code in my controller :

$dispatcher = JDispatcher::getInstance();
$return = $dispatcher->trigger('onCheckAnswer');
echo "return :<br>";

What this return :

response : string(0) ""

spam : bool(true)

return : bool(false)

I don't understand, someone can help me please ?

Thanks ;)

  • Did you create a new key to use with v2.0 of reCaptcha? The old keys won't work. Also, in the settings for the captcha plugin (Joomla backend), did you set it to v2.0?
    – Lodder
    Jun 12, 2015 at 8:12
  • No, it's not specified anywhere... And yes i set v2.0 in admin ;)
    – Cotral Lab
    Jun 12, 2015 at 8:48
  • I try to get new key, but the google admin of recaptcha get me the same keys for my website ;)
    – Cotral Lab
    Jun 12, 2015 at 8:53
  • You're going to need to get a new key
    – Lodder
    Jun 12, 2015 at 8:57
  • Ok, i've the new keys. But i doesn't work... Same problem.
    – Cotral Lab
    Jun 12, 2015 at 10:17

2 Answers 2


I got this solved by making sure the following conditions met

  1. allow_url_fopen = On in your PHP configuration

  2. jQuery is loaded on my page, if it is not loading, your template or some plugin might be suppressing somehow. check with your template developer.

  • Hi thanks for your answer. "allow_url_fopen" is "On" in my PHP configuration and jQuery is loaded by Joomla (included by default). But i still have my problem....
    – Cotral Lab
    Jun 15, 2015 at 7:49

$result = $dispatcher->trigger('onCheckAnswer',$input['recaptcha_response_field']);

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