wp_set_all_user_settings example

function set_user_setting( $name, $value ) {
    if ( headers_sent() ) {
        return false;
    }

    $all_user_settings          = get_all_user_settings();
    $all_user_settings[ $name ] = $value;

    return wp_set_all_user_settings( $all_user_settings );
}

/** * Deletes user interface settings. * * Deleting settings would reset them to the defaults. * * This function has to be used before any output has started as it calls `setcookie()`. * * @since 2.7.0 * * @param string $names The name or array of names of the setting to be deleted. * @return bool|null True if deleted successfully, false otherwise. * Null if the current user is not a member of the site. */