Add reCAPTCHA to WordPress Contact Form for Spam Protection

Code

// Function to enqueue reCAPTCHA script
function wp_dudecom_enqueue_recaptcha_script() {
    if (is_page('contact')) { // Adjust the condition to match your contact form page
        wp_enqueue_script('google-recaptcha', 'https://www.google.com/recaptcha/api.js', array(), null, true);
    }
}
add_action('wp_enqueue_scripts', 'wp_dudecom_enqueue_recaptcha_script');

// Function to display reCAPTCHA in Contact Form 7
function wp_dudecom_add_recaptcha_to_cf7($tag) {
    if ($tag['name'] == 'your-recaptcha') {
        return '<div class="g-recaptcha" data-sitekey="your-site-key"></div>'; // Replace 'your-site-key' with your actual site key
    }
    return $tag;
}
add_filter('wpcf7_form_elements', 'wp_dudecom_add_recaptcha_to_cf7');

// Function to verify reCAPTCHA response
function wp_dudecom_verify_recaptcha($result, $tags) {
    $recaptcha_secret = 'your-secret-key'; // Replace 'your-secret-key' with your actual secret key
    $recaptcha_response = $_POST['g-recaptcha-response'];

    $response = wp_remote_get("https://www.google.com/recaptcha/api/siteverify?secret={$recaptcha_secret}&response={$recaptcha_response}");
    $response_body = wp_remote_retrieve_body($response);
    $result_data = json_decode($response_body, true);

    if (!$result_data['success']) {
        $result->invalidate($tags['your-recaptcha'], 'reCAPTCHA verification failed. Please try again.');
    }

    return $result;
}
add_filter('wpcf7_validate', 'wp_dudecom_verify_recaptcha', 10, 2);

// Function to add reCAPTCHA field to Contact Form 7
function wp_dudecom_add_recaptcha_field() {
    echo '<p>[your-recaptcha]</p>';
}
add_action('wpcf7_init', 'wp_dudecom_add_recaptcha_field');