Eu estava usando o ReCaptcha antigo no meu site, mas apenas atualizando para o novo ReCaptcha eu tenho 3-4 tutoriais diferentes, mas ele continua falhando e dando o erro de falha.

HTML

<form method="POST" action="/feedback_sent/" enctype="multipart/form-data">
<table border="0" width="100%" cellpadding="4" cellspacing="4" height="67">
    <tr>
        <td width="30%" height="30">Name</td>
        <td width="70%" height="30">
            <p><input type="text" name="name" size="41"></p>
        </td>
    </tr>
    <tr>
        <td valign="top" width="30%" height="27">Feedback</td>
        <td width="70%" height="27">
        <textarea rows="8" name="feedback" cols="57"></textarea></td>
    </tr>   
    <tr>
        <td valign="top" width="30%" height="27"></td>
        <td width="70%" height="27">
        <div class="g-recaptcha" data-sitekey="My_Key"></div>
        </td>
    </tr>
    <tr>
        <td width="100%" colspan="2">
        <p align="center"><input type="submit" value="Submit" name="B1"></td>
    </tr>
</table>


</form>

PHP:

    $secret="---my key---";
    $response=$_POST["g-recaptcha-response"];
    $verify=file_get_contents("https://www.google.com/recaptcha/api/siteverify?secret={$secret}&response={$response}");
    $captcha_success=json_decode($verify);

    if ($captcha_success->success==false) {
        echo "<p>You are a bot! Go away!</p>";
    }
    else if ($captcha_success->success==true) {
            echo "<p>You are not not a bot!</p>";
    }