location / {
if ($host !~ "^www\.xmhudong\.com$"){
rewrite ^(.*) http://www.xmhudong.com$1 permanent;}

if (-f $request_filename/index.html){
rewrite (.*) $1/index.html break;
}
if (-f $request_filename/index.php){
rewrite (.*) $1/index.php;
}
if (!-f $request_filename){
rewrite (.*) /index.php;
}
}