用php写注册界面

<?php 
$name=$_POST[&#39;name&#39;]; 
$password=$_POST[&#39;password&#39;]; 
$password1=$_POST[&#39;password1&#39;]; 
if($name=="") 
{ 
echo "用户名不能为空"; 
echo "<meta http-equiv=refresh content=&#39;2 url=long.php&#39;>"; 
exit(); 
} 
$password=$_POST[&#39;password&#39;]; 
if($password=="") 
{ 
echo"密码不能为空"; 
echo "<meta http-equiv=refresh content=&#39;2 url=long.php&#39;>"; 
exit(); 
} 
if(strlen($password)>16 or strlen($password)<6) 
{ 
echo "请你输入一个6到16位的密码"; 
echo "<meta http-equiv=refresh content=&#39;2 url=long.php&#39;>"; 
exit(); 
} 
 if(strcmp($password1,$password)!=0) 
 { 
 echo "你输入的两次密码不一致"; 
 echo "<meta http-equiv=refresh content=&#39;2 url=long.php&#39;>"; 
 exit(); 
 } 
include"connect.php"; 
$sql="select *from rz where users=&#39;$name&#39;"; 
$query=mysql_query($sql); 
if($r=mysql_fetch_array($query)) 
{ 
 echo "此帐号已被人占用"; 
 exit(); 
} 
$password=md5($password); 
$sql="insert into rz(users,password) values(&#39;$name&#39;,md5(&#39;$password&#39;))"; 
$query=mysql_query($sql); 
echo "成功增加用户"; 
echo "<br>你好!".$name; 
echo $name."你已成为本站的一位新用户,系统将在5秒后返回开申请页面"; 
echo "<meta http-equiv=refresh content=&#39;5 url=long.php&#39;>"; 
?>