Grunion_Contact_Form_Plugin::is_spam_akismet PHP Method

    function is_spam_akismet($is_spam, $form = array())
    {
        global $akismet_api_host, $akismet_api_port;
        // The signature of this function changed from accepting just $form.
        // If something only sends an array, assume it's still using the old
        // signature and work around it.
        if (empty($form) && is_array($is_spam)) {
            $form = $is_spam;
            $is_spam = false;
        }
        // If a previous filter has alrady marked this as spam, trust that and move on.
        if ($is_spam) {
            return $is_spam;
        }
        if (!function_exists('akismet_http_post') && !defined('AKISMET_VERSION')) {
            return false;
        }
        $query_string = http_build_query($form);
        if (method_exists('Akismet', 'http_post')) {
            $response = Akismet::http_post($query_string, 'comment-check');
        } else {
            $response = akismet_http_post($query_string, $akismet_api_host, '/1.1/comment-check', $akismet_api_port);
        }
        $result = false;
        if (isset($response[0]['x-akismet-pro-tip']) && 'discard' === trim($response[0]['x-akismet-pro-tip']) && get_option('akismet_strictness') === '1') {
            $result = new WP_Error('feedback-discarded', __('Feedback discarded.', 'jetpack'));
        } elseif (isset($response[1]) && 'true' == trim($response[1])) {
            // 'true' is spam
            $result = true;
        }
        /**
         * Filter the results returned by Akismet for each submitted contact form.
         *
         * @module contact-form
         *
         * @since 1.3.1
         *
         * @param WP_Error|bool $result Is the submitted feedback spam.
         * @param array|bool $form Submitted feedback.
         */
        return apply_filters('contact_form_is_spam_akismet', $result, $form);
    }