php实现登录注册功能
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");
$info = sprintf("当前访问用户：%s,IP地址：%s,时间：%s
",$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
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