grecaptcha.getResponse(); returns empty line

Question

I am trying to implement google recaptcha v2 using ajax php but its not returning response after i solve it. i have two recaptchas, with different keys, first one works just fine.

after solving recaptcha: enter image description here

<div class="g-recaptcha" data-sitekey="key"></div>


 $.ajax({
            type: "POST",
            url: "contact.php",
            data: {
                name: name,
                email: email,
                subject: subject,
                message: message,
                captcha: grecaptcha.getResponse()
            }
        }).done(function (response) {
            var parsedResponse = JSON.parse(response);
            if (!parsedResponse.success) {
                $('#response').text(parsedResponse.message);
                $('#contact_form_2')[0].reset();
            } else {
                $('#response').text("Wiadomość została wysłana.");
            }
        }).fail(function (jqXHR, textStatus, errorThrown) {
            $('#response').text('Wystąpił błąd podczas wysyłania wiadomości.');
        });

 $recaptcha_secret = 'key';
    $rresponse=$_POST["captcha"];

$recaptcha_url = 'https://www.google.com/recaptcha/api/siteverify';
$recaptcha_data = array(
    'secret' => $recaptcha_secret,
    'response' => $rresponse
);

$recaptcha_options = array(
    'http' => array(
    'method' => 'POST',
    'header' => "Content-Type: application/x-www-form-urlencoded\r\n",
    'content' => http_build_query($recaptcha_data)
    )
);

$recaptcha_context = stream_context_create($recaptcha_options);
$recaptcha_result = file_get_contents($recaptcha_url, false, $recaptcha_context);
$recaptcha_json = json_decode($recaptcha_result);

if (!$recaptcha_json->success) {
    $response = array('success' => false, 'message' => 'Potwierdzenie reCAPTCHA nie powiodło się.');
    echo json_encode($response);
    return;
}

i was changing the code a lot, to the moment where captcha was working but it was redirecting to contact.php and not returing result to response as supposed. im in dead end