注册登录页面

<form id="form1" name="form1" method="post" action="checklogin.php">
  <p>
    <label>name
      <input type="text" name="name" id="name" />
    </label>
  </p>
  <p>
    <label>password
      <input type="password" name="password" id="password" />
    </label>
  </p>
  <p>
    <label>
      <input type="submit" name="post" id="post" value="Submit" />
    </label>
   <a href='zhuce.php'>注册</a>
  </p>
</form>
 

<form id="form1" name="form1" method="post" action="checklogin.php">
  <p>
    <label>name
      <input type="text" name="name" id="name" />
    </label>
  </p>
  <p>
    <label>password
      <input type="password" name="password" id="password" />
    </label>
  </p>
  <p>
    <label>
      <input type="submit" name="post" id="post" value="Submit" />
    </label>
   <a href='zhuce.php'>注册</a>
  </p>
</form>

<?php

$username=$_POST[name];
$password=$_POST[password];
if($_POST['name'] == "")

{

     echo "请填写用户名<br><a href='login.php'>返回</a>";

}elseif($_POST['password'] == "")

{

     echo "请填写密码<br><a href='login.php'>返回</a>";

}
else
{
$link = mysql_connect("localhost:3306","student","123456");
mysql_select_db('test');
$query = "select * from admin where username='$username' and password='$password'";
$result = mysql_query($query);
$row=mysql_num_rows($result);
if($row>0)
{
echo "<script language=\"JavaScript\">\r\n"; 
                   echo " alert(\"登陆成功\");\r\n"; 
                   echo " location.replace(\"success.php\");\r\n"; // 自己修改网址 
                   echo "</script>"; 
                   exit; 

}
else
{echo "<script language=\"JavaScript\">\r\n"; 
        echo " alert(\"您输入的密码不正确！请重新输入！\");\r\n"; 
        echo " history.back();\r\n"; 
        echo "</script>"; 
        exit; 
}
}

?>
<?php
echo "恭喜你登陆成功！"


?>
<form id="form1" name="form1" method="post" action="yanzhen.php">
  <p>
    <label>new name
      <input type="text" name="name" id="name" />
    </label>
  </p>
  <p>
    <label>new password
      <input type="password" name="password" id="password" />
    </label>
  </p>

 <p>
    <label>new password again
      <input type="password" name="newpassword" id="newpassword" />
    </label>
  </p>
    <label>
      <input type="submit" name="post" id="post" value="register" />
    </label>
   <a href='login.php'>返回</a>
  </p>
</form>


<?php
 $username=($_POST['name']);
 $password=($_POST['password']);
 $newpassword=($_POST['newpassword']);
 $link = mysql_connect("localhost:3306","student","123456");
 mysql_select_db('test');
if($username=="")
 {
  echo "<a href=zhuce.php>用户名不能为空</a>";
  return;
 }

if($password==$newpassword)
 {$link = mysql_connect("localhost:3306","student","123456");
  mysql_select_db('test');
  $query="insert into admin (username,password) values ('$username','$password');";
  mysql_query($query);
  mysql_query("commit");
  echo "<a href=login.php>注册成功</a>";
 }
else
 {echo "<a href=zhuce.php>密码不一致</a>";}
?>