php实现登录注册功能
PHP连接MySQL数据库实现用户的登录与注册功能
1.建立数据库
运用PHP连接MySQL数据库实现登录注册功能并将用户登录日志写入数据库，首先需要在数据库中建立需要的数据库 php 以及用户表 User和日志表 Logs。
User表结构
Logs表结构
数据库表建成
2.代码实现
注册页面register.php
<!DOCTYPE html>
<html>
<head>
<title>注册</title>
<meta name="content-type"; charset=UTF-8">
</head>
<body>
<div class="content" align="center">
<!--头部-->
<div class="header">
<h1>注册页面</h1>
</div>
<!--中部-->
<div class="middle">
<form action="registeraction.php" method="post">
<table border="0">
<tr>
<td>用户名：</td>
<td><input type="text" id="id_name" name="username" required="required"></td>
</tr>
<tr>
<td>密 码：</td>
<td><input type="password" id="password" name="password" required="required"></td>
</tr>
<tr>
<td>重复密码：</td>
<td><input type="password" id="re_password" name="re_password" required="required"></td>
</tr>
<tr>
<td>性别：</td>
<td>
<input type="radio" id="sex" name="sex" value="男">男
<input type="radio" id="sex" name="sex" value="女">女
</td>
</tr>
<tr>
<td>QQ：</td>
<td><input type="text" id="qq" name="qq" required="required"></td>
</tr>
<tr>
<td>Email：</td>
<td><input type="email" id="email" name="email" required="required"></td>
</tr>
<tr>
<td>电话：</td>
<td><input type="text" id="phone" name="phone" required="required"></td>
</tr>
<tr>
<td>地址：</td>
<td><input type="text" id="address" name="address" required="required"></td>
</tr>
<tr>
<td colspan="2" align="center" style="color:red;font-size:10px;">
<!--提示信息-->
<?php $err=isset($_GET["err"])?$_GET["err"]:""; switch($err) { case 1: echo "用户名已存在！"; break; case 2: echo "密码与重复密码不一致！"; break; case 3: echo "注册成功！"; break; } ?>
</td>
</tr>
<tr>
<td colspan="2" align="center">
<input type="submit" id="register" name="register" value="注册">
<input type="reset" id="reset" name="reset" value="重置">
</td>
</tr>
<tr>
<td colspan="2" align="center">
如果已有账号，快去<a href="login.php">登录</a>吧！
</td>
</tr>
</table>
</form>
</div>
<!--脚部-->
<div class="footer">
<small>Copyright © 版权所有·欢迎翻版
</div>
</div>
</body>
</html>注册处理页面 registeraction.php
<?php //声明变量 $username = isset($_POST['username'])?$_POST['username']:""; $password = isset($_POST['password'])?$_POST['password']:""; $re_password = isset($_POST['re_password'])?$_POST['re_password']:""; $sex = isset($_POST['sex'])?$_POST['sex']:""; $qq = isset($_POST['qq'])?$_POST['qq']:""; $email = isset($_POST['email'])?$_POST['email']:""; $phone = isset($_POST['phone'])?$_POST['phone']:""; $address = isset($_POST['address'])?$_POST['address']:""; if($password == $re_password) { //建立连接 $conn = mysqli_connect('localhost','root','123','php'); //准备SQL语句,查询用户名 $sql_select="SELECT username FROM User WHERE username = '$username'"; //执行SQL语句 $ret = mysqli_query($conn,$sql_select); $row = mysqli_fetch_array($ret); //判断用户名是否已存在 if($username == $row['username']) { //用户名已存在，显示提示信息 header("Location:register.php?err=1"); } else { //用户名不存在，插入数据 //准备SQL语句 $sql_insert = "INSERT INTO User(username,password,sex,qq,email,phone,address) VALUES('$username','$password','$sex','$qq','$email','$phone','$address')"; //执行SQL语句 mysqli_query($conn,$sql_insert); header("Location:register.php?err=3"); } //关闭数据库 mysqli_close($conn); } else { header("Location:register.php?err=2"); } ?>登录页面login.php
<!DOCTYPE html>
<html>
<head>
<title>登录</title>
<meta name="content-type"; charset=UTF-8">
</head>
<body>
<div class="content" align="center">
<!--头部-->
<div class="header">
<h1>登录页面</h1>
</div>
<!--中部-->
<div class="middle">
<form id="loginform" action="loginaction.php" method="post">
<table border="0">
<tr>
<td>用户名：</td>
<td>
<input type="text" id="name" name="username" required="required" value="<?php echo isset($_COOKIE["wang"])?$_COOKIE["wang"]:"";?>">
</td>
</tr>
<tr>
<td>密 码：</td>
<td><input type="password" id="password" name="password"></td>
</tr>
<tr>
<td colspan="2">
<input type="checkbox" name="remember"><small>记住我
</td>
</tr>
<tr>
<td colspan="2" align="center" style="color:red;font-size:10px;">
<!--提示信息-->
<?php $err=isset($_GET["err"])?$_GET["err"]:""; switch($err) { case 1: echo "用户名或密码错误！"; break; case 2: echo "用户名或密码不能为空！"; break; } ?>
</td>
</tr>
<tr>
<td colspan="2" align="center">
<input type="submit" id="login" name="login" value="登录">
<input type="reset" id="reset" name="reset" value="重置">
</td>
</tr>
<tr>
<td colspan="2" align="center">
还没有账号，快去<a href="register.php">注册</a>吧！
</td>
</tr>
</table>
</form>
</div>
<!--脚部-->
<div class="footer">
<small>Copyright © 版权所有·欢迎翻版
</div>
</div>
</body>
</html>登录处理页面 loginaction.php
<?php //声明变量 $username = isset($_POST['username'])?$_POST['username']:""; $password = isset($_POST['password'])?$_POST['password']:""; $remember = isset($_POST['remember'])?$_POST['remember']:""; //判断用户名和密码是否为空 if(!empty($username)&&!empty($password)) { //建立连接 $conn = mysqli_connect('localhost','root','123','php'); //准备SQL语句 $sql_select = "SELECT username,password FROM User WHERE username = '$username' AND password = '$password'"; //执行SQL语句 $ret = mysqli_query($conn,$sql_select); $row = mysqli_fetch_array($ret); //判断用户名或密码是否正确 if($username==$row['username']&&$password==$row['password']) { //选中“记住我” if($remember=="on") { //创建cookie setcookie("wang", $username, time()+7*24*3600); } //开启session session_start(); //创建session $_SESSION['user']=$username; //写入日志 $ip = $_SERVER['REMOTE_ADDR']; $date = date('Y-m-d H:m:s'); $info = sprintf("当前访问用户：%s,IP地址：%s,时间：%s \n",$username, $ip, $date); $sql_logs = "INSERT INTO Logs(username,ip,date) VALUES('$username','$ip','$date')"; //日志写入文件，如实现此功能，需要创建文件目录logs $f = fopen('./logs/'.date('Ymd').'.log','a+'); fwrite($f,$info); fclose($f); //跳转到loginsucc.php页面 header("Location:loginsucc.php"); //关闭数据库 mysqli_close($conn); }else { //用户名或密码错误，赋值err为1 header("Location:login.php?err=1"); } }else { //用户名或密码为空，赋值err为2 header("Location:login.php?err=2"); } ?>
登录成功页面 loginsucc.php
<!DOCTYPE html>
<html>
<head>
<title>登录成功</title>
<meta name="content-type"; charset=UTF-8">
</head>
<body>
<div>
<?php //开启session session_start(); //声明变量 $username= isset($_SESSION['user'])?$_SESSION['user']:""; //判断session是否为空 if(!empty($username)){ ?>
<h1>登录成功！</h1>
欢迎您！
<?php echo $username; ?>
<br/>
<a href="logout.php">退出</a>
<?php }else { //未登录，无权访问 ?>
<h1>你无权访问！！！</h1>
<?php } ?>
</div>
</body>
</html>退出页面logout.php
<?php
//开启session
session_start();
//撤销session
session_unset();
session_destroy();
//跳转到login.php
header("Location:login.php");
?>运行截图
