php会员管理系统

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

<?php
session_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>;


?>