如果用户登录，则自动重定向

Question

I've two pages: index.php and register.php . If the user is guest , he can click on register.php -->go to that page-->register a form and login. Upon logging in, he is redirected to index.php. Now if he/she tries to access signup.php -->they are automatically redirected to index.php . I'm using:

<?php 
   if(!isset($_SESSION['id']))
   {
      //show the form
      ....
   }
   else
   {
      header("Location: index.php");
      exit;
   }
   ?>

How ever, I'm getting a Cannot modify header information error. How else can I make the code to redirect when index.php and register.php are two separate pages.

Answer 1

What I do is create a seperate file named check_logged.php which I include at the top of pages you wish to block. What it does is check whether Add this to the top of your page

session_start();
include('php/check_logged.php');

Check_logged.php contains this:

if (!empty($_SESSION['id'])) {
    header('Location: index.php');
    exit;
}

Personally I needed a second check because my forms output a confirmation message after you successfully restore your password with this:

if(!isset($_SESSION['good_message'])){ //check if a confirmation message is set, if no continue to check if the user is logged in.
    if (!empty($_SESSION['id'])) {
        header('Location: index.php');
        exit;
    }
}

This way if you return to the login page and want to display a confirmation message it doesn't instantly redirect you. I tend to show my messages like this:

<span class="error"> <?php 
    if( IsSet( $_SESSION[ "message_sent" ] ) )  {
            echo "<p align='center' style='color: #8BA870;';> " . $_SESSION[ "message_sent" ] . "</p>";
            unset( $_SESSION[ "message_sent" ] );
}?></span>

It is shown once after which it unsets itself. So if you refresh the page the value is nog longer 'set' and you will be redirected to home.