PHP中最简单的方法:

Easiest way in PHP:

$url = preg_replace('/\?.*/', '', $url);

Facebook所做的可能就是这种方式的JavaScript:

What Facebook does is probably a JavaScript thing, in that fashion:

if (location.href.match(/\?.*/) && document.referrer) {
   location.href = location.href.replace(/\?.*/, '');
}