php 和 session 重定向错误

Question

我正在创建一个登录表单并使用 session 注销但是当我尝试登录浏览器时显示错误(我认为错误在记录的函数中) 任何人都可以帮助我，因为它让我发疯.....**页面没有正确重定向 Firefox 让服务器以一种永远不会检测到完整的方式重定向对此地址的请求。

这个问题有时可能是禁用或拒绝接受导致的 cookies 。**

登录.php

<?php
ob_start();
require_once('functions.php');


if(loggedin()){
    header("Location: userarea.php");
    exit();
}


if(isset($_POST['login'])){

  //get data
  $username = $_POST['username'];
  $password = $_POST['password'];
  $rememberme = $_POST['rememberme'];

  if($username && $password){

   $login = mysql_query("SELECT * FROM rememberme  WHERE username = '$username'");
   while($row = mysql_fetch_assoc($login)){

      $db_password = $row['password'];
      if($password == $db_password)
       $loginok = TRUE;
      else
        $loginok = FALSE;
      if($loginok == TRUE){

         if($rememberme == "on"){
          setcookie("username", $username, time()+7200);



         }else if($rememberme == "")
           $_SESSION['username'] = $username;
         header("Location: userarea.php");
         exit();   


      }else{
       die("incorrect username/password combination");

      }

   }



  }else
    die("please enter a username and password");
    exit();


}


?>

<form action="login.php" method="post">
<p>Username<br />
  <input type="text" name="username" />
</p>
<p> Password<br />
  <input type="password" name="password" />
</p>
<p>
  <input type="checkbox" name="rememberme"> 
  Remember me<br />

  <input type="submit" name="login" value="Log in" />
</p>
</form>
<?php ob_flush(); ?>

函数.php

 <?php
 //session
 session_start();
 // connect to database 
 mysql_connect("localhost", "root", "") or die("could not connect to database");
 mysql_select_db("rememberme") or die("could not select database");

// login check function

 function loggedin()
{
    $loggedin = false;
    if(isset($_SESSION['username'])||isset($_COOKIE['username']))
    {
        $loggedin = TRUE;
    }
    return $loggedin;
}

?>

用户区.php

<?php
 //session
 session_start();
 // connect to database 
 mysql_connect("localhost", "root", "") or die("could not connect to database");
 mysql_select_db("rememberme") or die("could not select database");

// login check function

function loggedin()
{

  if(isset($_SESSION['username'])||isset($_COOKIE['username'])){
    $loggedin = TRUE;
    return $loggedin;  


  }



}

?>

Answer 1

你在两个文件中有相同的功能。

function loggedin()

尝试

function loggedin()
{
    $loggedin = false;
    if(isset($_SESSION['username'])||isset($_COOKIE['username']))
    {
        $loggedin = TRUE;
    }
    return $loggedin;
}

如果你 if 条件不满足你的函数将不会返回 true 或 false，所以你需要将 initial 值设置为 false，然后如果 if condition 满足，则覆盖它。

登录.php

<?php
require_once('functions.php');

if(isset($_POST['login']))
{
    $username = $_POST['username'];
    $password = $_POST['password'];
    $rememberme = $_POST['rememberme'];

    if($username && $password)
    {
        $login = mysql_query("SELECT * FROM rememberme WHERE username = '".$username."'");
        while($row = mysql_fetch_assoc($login))
        {
            $db_password = $row['password'];
            if($password == $db_password)
                $loginok = TRUE;
            else
                $loginok = FALSE;
            if($loginok == TRUE)
            {
                if($rememberme == "on")
                {
                    setcookie("username", $username, time()+7200);
                }
                else if($rememberme == "")
                {
                    $_SESSION['username'] = $username;
                    header("Location: userarea.php");
                    exit();   
                }
            }
            else
            {
                die("incorrect username/password combination");
            }

        }
    }
    else
    {
        die("please enter a username and password");
        exit();
    }
}
?>

<form action="login.php" method="post">
    <p>Username<br />
        <input type="text" name="username" />
    </p>
    <p>Password<br />
        <input type="password" name="password" />
    </p>
    <p>
        <input type="checkbox" name="rememberme"> 
        Remember me<br />
        <input type="submit" name="login" value="Log in" />
    </p>
</form>
<?php ob_flush(); ?>

函数.php

<?php
ob_start();
session_start();
error_reporting(E_ALL);
ini_set('display_errors','On');

mysql_connect("localhost", "root", "") or die("could not connect to database");
mysql_select_db("rememberme") or die("could not select database");

// login check function

if(loggedin())
{
    header("Location: userarea.php");
    exit();
}

function loggedin()
{
    $loggedin = false;
    if(isset($_SESSION['username'])||isset($_COOKIE['username']))
    {
        $loggedin = TRUE;
    }
    return $loggedin;
}

?>

userarea.php

<?php
    require_once "functions.php";
    echo "after login";
?>