<?php
$_geturl = $_SERVER['HTTP_HOST'];
$_explodeurl = explode(".",$_geturl);
$url = $_explodeurl[0];
$_explodeurl = array_reverse($_explodeurl);
$urlgo = $_explodeurl[1].".".$_explodeurl[0];
$domian = "com.cn|net.cn|org.cn|gov.cn|bj.cn|sh.cn|tj.cn|cq.cn|zj.cn|nm.cn|ln.cn|jl.cn|hl.cn|js.cn|he.cn|ah.cn|fj.cn|jx.cn|sd.cn|ha.cn|hb.cn|hn.cn|gd.cn|gx.cn|hi.cn|sx.cn";
$domian = explode("|",$domian);
if (in_array($urlgo,$domian))
{
$urlgo = $_explodeurl[2].".".$_explodeurl[1].".".$_explodeurl[0];
}

function gourl_301(){
global $urlgo;
header("HTTP/1.1 301 Moved Permanently");
header('Location: http://www.'.$urlgo.'/');
exit();
}
if($_geturl==$urlgo){
gourl_301();
}
?>