PHP registration code

$Uname=$_POST["Uname"];

$Pwd=$_POST["Pwd"];

$register=$_POST["register"];

$link=mysql_connect("localhost","root","12345");

if($link)

{

       $db_selected=Mysql_Query("use register", $link);

   

     if ( $register="register")

        {

              if ( $Uname !="" )

          {

              $result=mysql_query("insert into [user] (Uname , Pwd) values($Uname, $Pwd)" , $link);

           echo ("<script>alert('注册成功 !');history.back; </script>");

          }

              else

           { echo("用户名不能为空!");

        }

}

else

{ echo("数据源连接失败!"); }

?>