举例：
有多个域名：site1.abc.com，site2.abc.com，site3.abc.com
分别在二级目录site1.abc.com/，site2.abc.com/，site3.abc.com/
.htaccess的代码如下
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| RewriteEngine On
RewriteCond %{HTTP_HOST} ^site1.abc.com$
RewriteCond %{REQUEST_URI} !^/site1.abc.com/
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ /site1.abc.com/$1
RewriteCond %{HTTP_HOST} ^site1.abc.com$
RewriteRule ^(/)?$ site1.abc.com/index.php [L]
RewriteCond %{HTTP_HOST} ^site2.abc.com$
RewriteCond %{REQUEST_URI} !^/site2.abc.com/
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ /site2.abc.com/$1
RewriteCond %{HTTP_HOST} ^site2.abc.com$
RewriteRule ^(/)?$ site2.abc.com/index.php [L]
RewriteCond %{HTTP_HOST} ^site3.abc.com$
RewriteCond %{REQUEST_URI} !^/site3.abc.com/
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ /site3.abc.com/$1
RewriteCond %{HTTP_HOST} ^site3.abc.com$
RewriteRule ^(/)?$ site3.abc.com/index.php [L]
|