如何在.htaccess中删除Google Adwords gclid查询字符串？

Question

我试过这些例子：

RewriteCond %{QUERY_STRING} !^gclid=
RewriteCond %{HTTP_REFERER} ^(.*)?gclid=([^&]+)
RewriteRule ^(.*)$ http://%{HTTP_HOST}/$1?gclid=%2 [QSA,L]

和

RewriteCond %{REQUEST_URI} ^/$
RewriteCond %{QUERY_STRING} ^(gclid=.*)
RewriteRule ^(.*)$ /index.php?/ [L,PT]