如果已经登录，我如何阻止我的PHP页面进入登录页面？ [英] How can I stop my PHP page from going to login page if it is already logged in?

问题描述

例如，在facebook中，如果我们登录一次而没有注销，请单击浏览器中的后退按钮，它会再次重新加载主页。但是在我使用PHP制作的登录页面中，我按下浏览器中的后退按钮，尽管我已经登录，但我还是回到了登录页面。



我尝试过：



以下是登录页面的代码：

As an example, in facebook if we log in once and without logging out click on the back button in the browser it reloads the home page again. But in the login page which I made using PHP is I press the back button in the browser it takes me back to the login page in spite of the fact that I am already logged in.

What I have tried:

The below is the code for login page:

include 'left.php';
mysql_connect('localhost','root','');
mysql_select_db('onlineexam');

if(isset($_POST['submit']))
{
   session_start();
   $_SESSION['email'] = $_POST['email'];
   $_SESSION['pass'] = $_POST['password'];
   $email = $_SESSION['email'];
   
   $query = mysql_query("select name,password,email from students where email = '$email'") or die("you are not registered");
   $arr = mysql_fetch_assoc($query);

   if ($arr['password']==$_SESSION['pass'])
   {
      $name = $arr['name'];
      echo "<div class="righttop">
            <h1>hello $name</h1><br>
            <form method='post' action='index.php'>
            <input type='submit' name='logout' value='LOGOUT'>
            </form>
            </br></div>";  
   }
   else
   {
      echo "<div class="righttop">
            <h1>Wrong Password. Try Again!!</h1>
            <?php include 'righttop.php'; ???>
            </div>";
      session_destroy();
      session_cache_expire();
   }
}
elseif(isset($_SESSION['email']))
{
   echo "halaluuya";
}
else
{
   header("Location: http://localhost/project/index.php");
   exit();
}

include 'rightbottom.php';
?>

推荐答案

_POST ['submit']））
{
session_start（ ）;

_POST['submit'])) { session_start();

_SESSION ['email'] =

_SESSION['email'] =

_POST ['email'];

_POST['email'];

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