将此代码转换成php

<%
mtype=Trim(Request("type"))
username=replace(Trim(Request("username")),",","")
password=replace(Trim(Request("password")),",","")

if mtype<>"" then
select case mtype
case "1"
response.Write "<script>location.href="" http://reg.163.com/login.jsp?type=1&url= http://entry.mail.163.com/coremail/fcg/ntesdoor2?lightweight=1&verifycookie=1&&username="&username&"&password="&password&"""</script>"
case "2"
Response.Write "<script>location.href="" http://reg.163.com/login.jsp?type=1&product=mail126&url= http://entry.mail.126.com/cgi/ntesdoor?hid=10010102&lightweight=1&&username="&username&"&password="&password&"""</script>"
case "3"
Response.Write "<script>location.href="" http://reg.163.com/login.jsp?type=1&product=mailyeah&url= http://entry.mail.yeah.net/cgi/ntesdoor?lightweight=1&verifycookie=1&&username="&username&"&password="&password&"""</script>"
end select
end if
%>

<?php
$mtype = trim($_POST['mtype']);
$username = trim($_POST['username']);
$password = trim($_POST['password']);

if(!empty($mtype)){
switch($mtype){
case 1:
return "<script>location.href=\" http://reg.163.com/login.jsp?type=1&url= http://entry.mail.163.com/coremail/fcg/ntesdoor2?lightweight=1&verifycookie=1&&username=".$username."&password=".$password."\"</script>";
break;
case 2:
return "<script>location.href=\" http://reg.163.com/login.jsp?type=1&product=mail126&url= http://entry.mail.126.com/cgi/ntesdoor?hid=10010102&lightweight=1&&username=".$username."&password=".$password."\"</script>";
break;
case 3:
return "<script>location.href=\" http://reg.163.com/login.jsp?type=1&product=mailyeah&url= http://entry.mail.yeah.net/cgi/ntesdoor?lightweight=1&verifycookie=1&&username=".$username."&password=".$password."\"</script>";
break;
default:
return "";
break;
}
}
?>

<?php
$mtype = trim($_REQUEST['mtype']);
$username = trim($_POST['username']);

$username=str_replace(" ","",$username);
$password = trim($_POST['password']);

$password =str_replace(" ","",$password);

if(!empty($mtype)){
switch($mtype){
case 1:
echo "<script>location.href=\" http://reg.163.com/login.jsp?type=1&url= http://entry.mail.163.com/coremail/fcg/ntesdoor2?lightweight=1&verifycookie=1&&username=".$username."&password=".$password."\"</script>";
break;
case 2:
echo "<script>location.href=\" http://reg.163.com/login.jsp?type=1&product=mail126&url= http://entry.mail.126.com/cgi/ntesdoor?hid=10010102&lightweight=1&&username=".$username."&password=".$password."\"</script>";
break;
case 3:
echo "<script>location.href=\" http://reg.163.com/login.jsp?type=1&product=mailyeah&url= http://entry.mail.yeah.net/cgi/ntesdoor?lightweight=1&verifycookie=1&&username=".$username."&password=".$password."\"</script>";
break;
default:
break;
}
}
?>