WordPress根据UA切换主题

function ua_switching_theme() {
    if (strpos($_SERVER['HTTP_USER_AGENT'], 'yunluo') !== false) {
        $theme = 'Git-alpha';
    } else {
        $theme = 'html5blank';
    }
    return $theme;
}
add_filter('template', 'ua_switching_theme');
add_filter('stylesheet', 'ua_switching_theme');