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Google の非表示の recaptcha を取得しようとしていますが、検証後に応答がありません。

これが私のコードです：

invisible_recaptcha.php (フォーム)

<!doctype html>
    <html>
    <head>
    <meta charset="utf-8">
    <title>Recaptcha Demo</title>
    <script src="https://www.google.com/recaptcha/api.js" async defer></script>
    <script>
        function onSubmit(token) {
            document.getElementById("i-recaptcha").submit();
        }
    </script>
    </head>
    <body> 
        <!-- FORM GOES HERE -->
        <form id='i-recaptcha' action="process_recaptcha.php" method="post">
            <label for="fname">First Name*</label><br>
            <input type="text" name="fname" id="fname" required autofocus><br><br>

            <label for="lname">Last Name*</label><br>
            <input type="text" name="lname" id="lname" required><br><br>

            <label for="email">Email Address*</label><br>
            <input type="email" name="email" id="email" required><br><br>

            <button class="g-recaptcha" data-sitekey="XXXXXXmy_site_keyXXXXXXXXX" data-size="invisible" data-callback="onSubmit">
                Submit
            </button>
        </form>


    </body>
    </html>

process_recaptcha.php (recaptcha の検証)

<?php
// Checks if form has been submitted
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    function post_captcha($user_response) {
        $fields_string = '';
        $fields = array(
            'secret' => 'XXXXXX_my_secret_key_XXXXXXXXX',
            'response' => $user_response
        );
        foreach($fields as $key=>$value)
        $fields_string .= $key . '=' . $value . '&';
        $fields_string = rtrim($fields_string, '&');

        //echo $user_response."<br><br><br><br>". $fields_string;exit;
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, 'https://www.google.com/recaptcha/api/siteverify');
        curl_setopt($ch, CURLOPT_POST, count($fields));
        curl_setopt($ch, CURLOPT_POSTFIELDS, $fields_string);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, True);

        $result = curl_exec($ch);
        curl_close($ch);

        return json_decode($result, true);
    }

    // Call the function post_captcha
    $res = post_captcha($_POST['g-recaptcha-response']);
    if (!$res['success']) {
        // What happens when the reCAPTCHA is not properly set up
        echo 'reCAPTCHA error: Check to make sure your keys match the registered domain and are in the correct locations. You may also want to doublecheck your code for typos or syntax errors.';
    } else {
        // If CAPTCHA is successful...

        // Paste mail function or whatever else you want to happen here!
        echo '<br><p>CAPTCHA was completed successfully!</p><br>';
    }
} ?>

常に次のメッセージが表示されます: reCAPTCHA エラー: キーが登録済みドメインと一致し、正しい場所にあることを確認してください。タイプミスや構文エラーがないか、コードを再確認することもできます。

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