也许此示例可以为您提供帮助:

Maybe this example can help you:

RewriteEngine On
RewriteCond %{HTTP_HOST} !^www\.example\.com$ [NC]
RewriteCond %{HTTP_HOST} ^([a-zA-Z0-9]+)\.example\.com$ [NC]
RewriteCond %{REQUEST_URI} !^/?do\.php$
RewriteRule .? do.php?url=%1&path=%{REQUEST_URI} [L,QSA]