PHP实现简易用户登录系统

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" rel="external nofollow"  ><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" rel="external nofollow"  ><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>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持NICE源码。

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