/*
 *
 * Save email in a cookie for ActiveCampaign
 *
 */
add_filter( 'gform_save_field_value', 'tlc_save_field_value', 10, 4);
function tlc_save_field_value( $value, $lead, $field, $form ) {
    if ($field['label'] == 'Your Email') {
        setcookie( 'email', htmlspecialchars($value, ENT_QUOTES), time() + 99999999, '/', NULL );
    }
    return $value;
}

/*
 *
 * Website tracking for ActiveCampaign
 *
 */
add_filter('wp_head', 'tlc_ac_tracking_email');
function tlc_ac_tracking_email() {
    if ( isset( $_COOKIE['email'] ) ) {
        echo '<script type="text/javascript">
        var trackcmp_email = "' . htmlspecialchars( $_COOKIE["email"] ) . '";
        var trackcmp = document.createElement("script");
        trackcmp.async = true;
        trackcmp.type = "text/javascript";
        trackcmp.src = "//trackcmp.net/visit?actid=123456789&e="+encodeURIComponent(trackcmp_email)+"&r="+encodeURIComponent(document.referrer)+"&u="+encodeURIComponent(window.location.href);
        var trackcmp_s = document.getElementsByTagName("script");
        if (trackcmp_s.length) {
            trackcmp_s[0].parentNode.appendChild(trackcmp);
        } else {
            var trackcmp_h = document.getElementsByTagName("head");
            trackcmp_h.length && trackcmp_h[0].appendChild(trackcmp);
        }
        </script>';
    }
}