PHP怎么写登录和注册页面

登陆界面 login.php

<form action="logincheck.php" method="post">      用户名：<input type="text" name="username" />      <br />      密码：<input type="password" name="password" />      <br />      <input type="submit" name="submit" html' target='_blank'>value="登陆" />                <a href="register.php">注册</a>  </form>

登录处理界面 logincheck.php

<?php      if(isset($_POST["submit"]) && $_POST["submit"] == "登陆")      {          $user = $_POST["username"];          $psw = $_POST["password"];          if($user == "" || $psw == "")          {              echo "<script>alert('请输入用户名或密码！'); history.go(-1);</script>";          }          else          {              mysql_connect("localhost","root","sixx");              mysql_select_db("vt");              mysql_query("set names 'gbk'");              $sql = "select username,password from user where username = '$_POST[username]' and password = '$_POST[password]'";              $result = mysql_query($sql);              $num = mysql_num_rows($result);              if($num)              {                  $row = mysql_fetch_array($result);  //将数据以索引方式储存在数组中                  echo $row[0];              }              else              {                  echo "<script>alert('用户名或密码不正确！');history.go(-1);</script>";              }          }      }      else      {          echo "<script>alert('提交未成功！'); history.go(-1);</script>";      }    ?>

注册界面 register.php

<form action="regcheck.php" method="post">      用户名：<input type="text" name="username"/>      <br/>      密　码:<input type="password" name="password"/>      <br/>      确认密码：<input type="password" name="confirm"/>      <br/>      <input type="Submit" name="Submit" value="注册"/>  </form>

注册处理界面 regcheck.php

<?php      if(isset($_POST["Submit"]) && $_POST["Submit"] == "注册")      {          $user = $_POST["username"];          $psw = $_POST["password"];          $psw_confirm = $_POST["confirm"];          if($user == "" || $psw == "" || $psw_confirm == "")          {              echo "<script>alert('请确认信息完整性！'); history.go(-1);</script>";          }          else          {              if($psw == $psw_confirm)              {                  mysql_connect("localhost","root","sixx");   //连接数据库                  mysql_select_db("vt");  //选择数据库                  mysql_query("set names 'gdk'"); //设定字符集                  $sql = "select username from user where username = '$_POST[username]'"; //SQL语句                  $result = mysql_query($sql);    //执行SQL语句                  $num = mysql_num_rows($result); //统计执行结果影响的行数                  if($num)    //如果已经存在该用户                  {                      echo "<script>alert('用户名已存在'); history.go(-1);</script>";                  }                  else    //不存在当前注册用户名称                  {                      $sql_insert = "insert into user (username,password,phone,address) values('$_POST[username]','$_POST[password]','','')";                      $res_insert = mysql_query($sql_insert);                      //$num_insert = mysql_num_rows($res_insert);                      if($res_insert)                      {                          echo "<script>alert('注册成功！'); history.go(-1);</script>";                      }                      else                      {                          echo "<script>alert('系统繁忙，请稍候！'); history.go(-1);</script>";                      }                  }              }              else              {                  echo "<script>alert('密码不一致！'); history.go(-1);</script>";              }          }      }      else      {          echo "<script>alert('提交未成功！'); history.go(-1);</script>";      }  ?>

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