我找到的解决方案之一是存储集合get_theme_mod($name) 进入PHP$_SESSION["$name"]. 如果会话存在，请比较新的get_theme_mod($name) 给那个老人$_SESSION["$name"], 如果他们不一样的话// do something..:

// Check if the user is an admin for validation to improve performance.
if (current_user_can( \'manage_options\' )) {
    session_start();

    // If the session is not set, the OLD is not equal to the NEW.
    if (!isset($_SESSION[\'theme_mod_name\']) {
        // do something..

        $_SESSION[\'theme_mod_name\'] = get_theme_mod(\'theme_mod_name\');
    } else {
        $theme_mod_name   = get_theme_mod(\'theme_mod_name\');
        $theme_mod_name_s = $_SESSION[\'theme_mod_name\'];

        // Check if the OLD is equal to the NEW.
        if ($theme_mod_name !== $theme_mod_name_s) {
            // do something..

            // Override the existing session for future validation.
            $_SESSION[\'theme_mod_name\'] = get_theme_mod(\'theme_mod_name\');
        }
    }
}