Question

我正在尝试使用“记住我”功能和注销选项为“登录”页面编写一个PHP代码。由于我是php的新手，我正在尝试使用静态用户名和密码而不使用ant数据库访问。但我的问题是php会话，我完全不理解，所以当我尝试登录时，它带我欢迎页面，但显示你没有登录。这是login.php

<?php
@$id=$_POST['username'];
@$pass = $_POST['password'];
$loginErr="";
if(isset($_POST['login']))
{
    if($id=="sajan" && $_POST['password']="sajan123")
    {
        if($_POST['remember_me']=='on' || $_POST['remember_me']== 1)
        {
        setcookie("user", $_POST['username'] , time()+(86400 * 30),'/');
        setcookie("password", $pass = $_POST['password'] , time()+(86400 * 30));
        header('location: welcome.php');
        exit;
        }
        else {
                setcookie("user", "" , time()-3600,'/');
                setcookie("password", "" , time()-3600);
                header('location: welcome.php');
                exit;
             }
    }
    else $loginErr="invalid username or password";
 }
 ?>
<html>
<head>
<link rel="stylesheet" href="./style.css" type="text/css">
</head>
<body>
    <div id="main">
    <form method="POST" action="<?php echo $_SERVER['PHP_SELF']?>" name="login">
    <h2 style="margin:0 0 15px 0;">LOGIN</h2>
    <label>Username</label>
    <input type="text" name="username" value="<?php echo @$_COOKIE['user'];?>">
    <label>Password</label>
    <input type="password" name="password" value="<?php echo @$_COOKIE['password'];?>"/>    
    <input type="checkbox" name="remember_me" class="check" <?php if(isset($_COOKIE['user'])) 
    {
    echo 'checked="checked"';
    }
else   {
        echo '';
        }
?>/>
    <label style="width:200px;">Remember me</label>
        <input class="submit" type="submit" name="login" value="Login" />
        <div style="float:left; color:red;"><?php echo $loginErr;?></div>
</form>
</div>
</body>
</html>

这是我的welcome.php页面

 <?php
    if (!isset($_SESSION['user'])) 
            {
                echo "you are not logged in ";
                echo isset($_SESSION);
                exit;
            }
       else {
                 echo "Welcome ".$_COOKIE['user']." .<br>";
                echo "Your login is successful. ";
            }
?>

和我的logout.php页面

<?php
session_start();
unset($_SESSION);
session_destroy();
session_write_close();
header('Location: login.php');
exit;
?>

Answer 1

登录成功时未定义

SESSION ，因此首先定义 SESSION 并在欢迎页面中签入以供进一步使用...试试这个...

if($id=="sajan" && $_POST['password']="sajan123")
    {
         session_start();
         $_SESSION['user']=$id;  //assgn a value to session when successful login
        if($_POST['remember_me']=='on' || $_POST['remember_me']== 1)
        {
        setcookie("user", $_POST['username'] , time()+(86400 * 30),'/');
        setcookie("password", $pass = $_POST['password'] , time()+(86400 * 30));
        header('location: welcome.php');
        exit;
        }
        else {
                setcookie("user", "" , time()-3600,'/');
                setcookie("password", "" , time()-3600);
                header('location: welcome.php');
                exit;
             }
    }

Answer 2

基本上你没有启动session，你怎么能指望程序在另一页上返回一个会话变量。

试试这个：

<?php
//Starting session
session_start();
@$id=$_POST['username'];
@$pass = $_POST['password'];



$loginErr="";
if(isset($_POST['login']))
{
    //Creating session variable
    $_SESSION['user'] = $id;


     //EDIT: $_POST['password']=="sajan123"
    if($id=="sajan" && $_POST['password']=="sajan123")
    {
        if($_POST['remember_me']=='on' || $_POST['remember_me']== 1)
        {
        setcookie("user", $_POST['username'] , time()+(86400 * 30),'/');
        setcookie("password", $pass = $_POST['password'] , time()+(86400 * 30));
        header('location: welcome.php');
        exit;
        }
        else {
                setcookie("user", "" , time()-3600,'/');
                setcookie("password", "" , time()-3600);
                header('location: welcome.php');
                exit;
             }
    }
    else $loginErr="invalid username or password";
 }
 ?>

Answer 3

您在welcome.php中检查了!isset($_SESSION['user'])，而不是$_COOKIE['user']

Answer 4

您忘记在登录时设置会话变量尝试此代码将起作用

<?php
if(isset($_POST['login']))
{
    if($id=="sajan" && $_POST['password']="sajan123")
    {

        session_start();
      $_SESSION['username']=$_POST['username'];


        if($_POST['remember_me']=='on' || $_POST['remember_me']== 1)
        {

        setcookie("user", $_POST['username'] , time()+(86400 * 30),'/');
        setcookie("password", $pass = $_POST['password'] , time()+(86400 * 30));
        header('location: welcome.php');
        exit;
        }
        else {
                setcookie("user", "" , time()-3600,'/');
                setcookie("password", "" , time()-3600);
                header('location: welcome.php');
                exit;
             }
    }
    else $loginErr="invalid username or password";
 }
 ?>

Answer 5

您必须首先检查SESSION是否已创建，以便有人访问此页面并且已经记录，它可以正确地重定向他：

<?php 
   session_start();
   if (isset($_SESSION['username']) {
       if ($_SESSION['username']=="sajan" && $_SESSION['password']="sajan123") {
           header('location: welcome.php');
       }
    } else if (isset($_POST['login'])) {
           $id = $_POST['username'];
           $pass = $_POST['password'];

           if($id=="sajan" && $_POST['password']="sajan123") {

               $_SESSION['username'] = $_POST['username'];
               $_SESSION['password'] = $_POST['password'];

               if($_POST['remember_me']=='on' || $_POST['remember_me']== 1) {

                   setcookie("user", $id, time()+(86400 * 30),'/');
                   setcookie("password", $pass, time()+(86400 * 30));
                   header('location: welcome.php');
                   exit;
               }
               else {
                   setcookie("user", "" , time()-3600,'/');
                   setcookie("password", "" , time()-3600);
                   header('location: welcome.php');
                   exit;
              }
        } else {
            $loginErr="invalid username or password"; 
        }
    }
?>

php会话无法正常工作

5 个答案: