first/enter.php at master · wufengwind/first · GitHub

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<!doctype html>
<html>
<head>
 <meta charset="UTF-8">
 <title>log in</title>
</head>
<body>
 <?php
 session_start();//登录系统开启一个session内容
 $username=$_REQUEST["username"];//获取html中的用户名（通过post请求）
 $password=$_REQUEST["password"];//获取html中的密码（通过post请求）

 $con=new mysqli("localhost","root","0418","user_info");//连接mysql 数据库，账户名root ，密码root
 if ($con->connect_error) {
 die('Connect database failed'.$mysqli_error);
 }
 //mysqli_select_db("user_info",$con);//use user_info数据库；
 $dbusername="";
 $dbpassword="";
 $sql="select*from user_info where username='$username';";
 //$result=mysqli_query("select * from user_info where username ='$username';");//查出对应用户名的信息
 $result=$con->query($sql);
 if($result->num_rows>0){
    while($row=$result->fetch_assoc()){
        $dbusername=$row["username"];
        $dbpassword=$row["password"];
    }
 }else{
   ?>
   <script type="text/javascript">
 alert("The username doesn't exist");
 window.location.href="index.html";
 </script>
 <?php
 }
 if($password==$dbpassword){
   ?>
   <script type="text/javascript">
 window.location.href="welcome.php";
 </script>
 <?php

 }else{
     ?>
     <script type="text/javascript">
 alert("password error!");
 window.location.href="index.html";
 </script>
 <?php
 }
$con->close();
 ?>


</body>
</html>