前台登录页面
<form action="session.php" method="POST">账 ?号：<input name="username" type="text" /><br><br>密 ?码：<input name="password" type="password" /><br><br><input name="sub" type="submit" value="登录" /></form>
验证页面
<?phpsession_start();include_once ‘conn.php‘; ???$username=$_POST[‘username‘]; ???$password=$_POST[‘password‘]; ???$sql="select * from data where username=‘".$username."‘ and password=‘".$password."‘"; ???$query=mysql_query($sql); ???$row=mysql_fetch_array($query); ???$_SESSION[‘username‘]=$username; ???$_SESSION[‘password‘]=$password; ???if (!$row){ ???????echo "<script language=‘javascript‘>alert(‘用户名或密码错误！‘);location=‘index.php‘;</script>"; ???}else{ ???????echo "<script language=‘javascript‘>alert(‘登陆成功！‘);location=‘user.php‘;</script>"; ???}?>后台页面
<?php session_start();if ($_SESSION[‘username‘]=="" ||$_SESSION[‘password‘==""]){ ???echo "<script language=‘javascript‘>alert(‘请先登录！‘);location=‘../index.php‘;</script>";}?><?php$user = $_SESSION[‘username‘];$conn=mysqli_connect("localhost","root","root");$db=mysqli_select_db($conn,"rmb");$sql="select * from data where username=‘".$user."‘";$re=mysqli_query($conn,$sql);$r=mysqli_fetch_array($re);echo "<br>";echo "用户：".$_SESSION[‘username‘]." <a href=‘zx.php‘>退出</a><br>;?> ???????php会员管理系统
原文地址：https://www.cnblogs.com/grey-network/p/9063573.html