PHP实现简易用户登录系统

发布:smiling　来源: PHP粉丝网　添加日期：2022-03-17 08:10:05　浏览: 评论：0　

这篇文章主要为大家详细介绍了PHP实现简易用户登录系统，文中示例代码介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们可以参考一下。

PHP简易用户登录系统，供大家参考，具体内容如下

最近刚刚看到PHP连接数据库的实例，于是做了一个简易的用户系统

直接上代码

连接数据库：connect.php

<?php

$servername = "localhost";

$username = "formbd";

$password = "formbd";

$dbname = "form";



// 创建连接

$conn = new mysqli($servername, $username, $password, $dbname);



// 检测连接

if ($conn->connect_error) {

  die("连接失败: " . $conn->connect_error);

}

?>

用户注册前端页面:reg.html

<!doctype html>

<html lang="en">

  <head>

    <meta charset="UTF-8">

    <title>用户注册页面</title>

  </head>

  <body>

    <form action="reg.php" method="post">

      <p>用户名:<input type="text" name="name"></p>

      <p>密码: <input type="text" name="password"></p>

      <p><input type="submit" name="submit" value="注册">

        <a href="login.html" ><input type="button" name="login" value="已有账号，返回登录"></a>

      </p>

    </form>

  </body>

</html>

注册后端处理:reg.php

<?php

  header("Content-Type: text/html; charset=utf8");

  if(!isset($_POST['submit'])){

    exit("错误执行");

  }//判断是否有submit操作

  $name=$_POST['name'];//post获取表单里的name

  $user_password=$_POST['password'];//post获取表单里的password

  include('connect.php');//链接数据库

  $q="insert into user(id,username,password) values (null,'$name','$user_password')";//向数据库插入表单传来的值的sql

  $sql = "select * from user where username = '$name'";



  if (($conn->query($sql))==$name) {

    echo '用户名已存在';

    $result = $conn->query($sql);

    /*echo "

          <script>

              setTimeout(function(){window.location.href='reg.html';},1000);

          </script>

        ";*/

  }

  else {

  $conn->query($q);

  echo "注册成功";

  echo "

          <script>

              setTimeout(function(){window.location.href='login.html';},1000);

          </script>

        ";

}



  $conn->close();//关闭数据库

?>

用户登录前端页面:login.html

<!doctype html>

<html lang="en">

  <head>

    <meta charset="UTF-8">

    <title>登陆</title>

  </head>

  <body>

    <form name="login" action="login.php" method="post">

        <p>用户名<input type=text name="name"></p>

        <p>密码<input type=password name="password"></p>

        <p><input type="submit" name="submit" value="登录">

          <a href="reg.html" ><input type="button" name="reg" value="注册"></a>

        </p>

      </form>

  </body>

</html>

登录后端处理:login.php

<?PHP

  header("Content-Type: text/html; charset=utf8");

  if(!isset($_POST["submit"])){

    exit("错误执行");

  }//检测是否有submit操作

  include('connect.php');//链接数据库

  $name = $_POST['name'];//post获得用户名表单值

  $passowrd = $_POST['password'];//post获得用户密码单值

  if ($name && $passowrd){//如果用户名和密码都不为空

       $sql = "select * from user where username = '$name' and password='$passowrd'";//检测数据库是否有对应的username和password的sql

       $result = $conn->query($sql);//执行sql

       $rows=$result->fetch_assoc();//返回一个数值

       if($rows){//0 false 1 true

          header("refresh:0;url=success.php");//如果成功跳转至success.php页面

          exit;

       }else{

        echo "用户名或密码错误";

        echo "

          <script>

              setTimeout(function(){window.location.href='login.html';},1000);

          </script>

        ";//如果错误使用js 1秒后跳转到登录页面重试;

       }



  }else{//如果用户名或密码有空

        echo "表单填写不完整";

        echo "

           <script>

              setTimeout(function(){window.location.href='login.html';},1000);

           </script>";

            //如果错误使用js 1秒后跳转到登录页面重试;

  }

  $conn->close();//关闭数据库

?>

登录成功后:success.php

PS:功能未完善

<?php

include 'connect.php';

session_start(); //声明变量

$username = isset($_SESSION['nmae']) ? $_SESSION['name'] : "";

?>

<!doctype html>

<html lang="en">

  <head>

    <meta charset="UTF-8">

    <title>登陆成功</title>

  </head>

  <body>

    欢迎光临

    <?php echo $username;?>

    <?php ?>

  </body>

</html>