问翻译PHP代码？

<?php

error_reporting(0);

$username=$_GET["username"];

$passwd=$_GET["pswd"];

$passwd1=$_GET["pswd1"];

$ty=$_GET["ty"];

if ($username==""||$passwd==""||$passwd1=="") {

echo"<script>alert('用户名和密码不能为空！')</script>";

header("refresh:0;url=zhuce.html");

die();

}

if ($ty=="") {

echo"<script>alert('请同意网站协议！')</script>";

header("refresh:0;url=zhuce.html");

die();

}

if($passwd!=$passwd1){

echo"<script>alert('密码与前面不一致')</script>";

header("refresh:0;url=zhuce.html");

}

$link=mysql_connect("127.0.0.1","root","root")

or die("数据库服务器连接失败！<BR>");

mysql_select_db("pptonline",$link) or die("数据库选择失败！<BR>");

mysql_query("set names 'gbk'");

$sql="select username from userxinxi where username='$username'";

$result=mysql_query($sql,$link);

$row = mysql_fetch_array($result);

if ($row) {

echo"<script>alert('此用户名已经存在!')</script>";

header("refresh:0;url=zhuce.html");

}

$sql="INSERT INTO userxinxi(username,passwd,sf)

VALUES('$username',password('$passwd'),'用户')";

if (mysql_query($sql,$link)){

echo "<script>alert('恭喜您成为新用户!')</script>";

header("refresh:0;url=login.php");}

else{

echo "<script>alert('用户注册失败!')</script>";

header("refresh:0;url=login.php");}

?>