php login register

Registration page (index.html):

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <span>注册:</span>
    <form action="index.php" method="post" style="margin-left: 50px;">
        名称:<input type="text" name="username">
        <br>
        密码:<input type="password" name="password">
        <br>
    <button>注册</button>
    </form>
    <form action="test.html">
        跳转到:<button>登录</button>
    </form>
</body>
</html>

Registration page (index.php):

<?php
// 账号
$user = $_POST['username'];
// echo $user;
// 密码
$pass = $_POST['password'];
// echo $pass;

// 判断账号密码是否为空
// 账号
if(empty($user) || empty($pass)){
    // echo '$user is empty';
    echo "<script>alert('请输入完整内容');
    window.location.href = 'index.html';
   </script>";
}else{
    // 连接数据库
    $servername = "localhost";
    $username = "root";
    $passwrod = "asdf1234";
    $dbname = "denglu";
    $conn = new mysqli($servername, $username, $passwrod, $dbname);
    if($conn -> connection_error){
        die('连接失败');
    }else{
        // echo "连接成功";
    }
    
    // 创建数据库
    // $sql = "CREATE DATABASE denglu";
    // if($conn -> query($sql) === TRUE){
    //     echo "数据库创建成功";
    // }else{
    //     echo "数据库创建失败";
    // }

    // 插入单挑数据
    $sql = "SELECT username,password FROM denglu WHERE username = '$user'";
    $result = mysqli_query($conn, $sql);
    $row = mysqli_fetch_assoc($result);
    //  var_dump($sql);
    //  echo "<br>";
    //  var_dump($result);
    //  echo "<br>";

    // var_dump($row);
    if($row){
        echo "该账号已存在";
    }else{
        $sqll = "INSERT INTO denglu (username, password)
        VALUES('$user', '$pass')";
    // $result = mysqli_query($conn, $sqll);
    //   var_dump($result);
    // $row = mysqli_fetch_assoc($result);
// var_dump($row);
        if($conn->query($sqll)){
            $resulf = [
                'code' =>1,
                'msg' => '注册成功',
               ];
               echo json_encode($resulf);
        }else{
            $resulf = [
                'code' =>2,
                'msg' => '注册失败',
               ];
               echo json_encode($resulf);
        }
    }
}
?>

Registration page (test.html):

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <span>登录:</span>
    <form action="test.php" method="post" style="margin-left: 50px;">
        名称:<input type="text" name="username">
        <br>
        密码:<input type="password" name="password">
        <br>
        <button>登录</button>
    </form>

    <form action="index.html">
        跳转到:<button>注册</button>
    </form>
</body>

</html>

Registration page (test.php):

<?php
// 账户
$user = $_POST['username'];
// echo $user;
echo '<br>';
// 密码
$pass = $_POST['password'];
// echo $pass;
if(empty($user) || empty($pass)){
    // echo '$user is empty';
    echo "<script>alert('请输入完整内容');
    window.location.href = 'test.html';
   </script>";
}else{
    // 连接数据库
    $servername = "localhost";
    $username = "root";
    $passwrod = "asdf1234";
    $dbname = "denglu";
    $conn = new mysqli($servername, $username, $passwrod, $dbname);
    if($conn -> connection_error){
        die('连接失败');
    }else{
        // echo "连接成功";
    }


    // 查询数据
    $sql = "SELECT username,password FROM denglu WHERE username = '$user'";
    $result = mysqli_query($conn, $sql);

    // echo $sql;die;
    if($conn->query($sql)){
        $row = mysqli_fetch_assoc($result);
        // var_dump($row);
        if($row['password'] == $pass){
           $resulf = [
            'code' =>1,
            'msg' => '成功',
            'data' =>$row,
           ];
           echo json_encode($resulf);
        }else{
            $resulf = [
                'code' =>0,
                'msg' => 'error',
               ];
               echo json_encode($resulf);
        }
    }else{
        echo "查询失败";
    }

    
}


?>

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