Working with PHP Sessions

I just developed a user login system and want to create different sessions for different users.

How do I write a code in PHP so that it starts a session and if the username entered is "a", it redirects to a different开发者_运维百科 page and if the username is "b", it redirects to a different page.

Update:

I used this

session_start();

switch ($_SESSION['username']) {
    case 'a':
        // $_SESSION['username'] is 'a'
        // redirect to file1.php
        header('Location: file1.php');
        die();
        break;
    case 'b':
        // $_SESSION['username'] is 'b'
        // redirect to file2.php
        header('Location: file2.php');
        die();
        break;
    default:
        // $_SESSION['username'] is neither a, nor b, or is not set at all
        // redirect to default.php
        header('Location: default.php');
        die();
        break;
}

but no matter what username I enter, it is taking me to file1.php

session_start();

// ...

if ($_SESSION['username'] == 'a') {
    header("Location: ./page_a");
} else if ($_SESSION['username'] == 'b') {
    header("Location: ./page_b");
} else {
    header("Location: ./otherpage");
}

Simply start php sessions with:

session_start() ;

Then, on login, save the logged in user's id to:

$_SESSION['currentuser'] = $userid ;

On logout, don't forget to:

unset($_SESSION['currentuser']) ;

On the page you want to display differently to each user, check $_SESSION['currentuser'] and then redirect:

if($_SESSION['currentuser'] == 1) {
    Header("Location:/page1.php") ;
} else {
    Header("Location:/page_default.php") ;
}
exit ;

All of your PHP pages should start with:

<?php
session_start();

You'll set session variables like this:

$_SESSION['myVariableName'] = 'myIntendedValue';

So when you process the login, you'll likely set a session variable for username or userid, and then you can handle that redirection:

if (isset($_SESSION['userName']) && $_SESSION['userName'] == "a") {
    header("Location: pageA.php");
    exit();
} else if (isset($_SESSION['userName']) && $_SESSION['userName'] == "b") {
    header("Location: pageB.php");
    exit();
}

Using switch() instead of if statements:

session_start();

switch ($_SESSION['username'])
{
    case 'a':
        // $_SESSION['username'] is 'a'
        // redirect to file1.php
        header('Location: file1.php');
        die();
        break;
    case 'b':
        // $_SESSION['username'] is 'b'
        // redirect to file2.php
        header('Location: file2.php');
        die();
        break;
    default:
        // $_SESSION['username'] is neither a, nor b, or is not set at all
        // redirect to default.php
        header('Location: default.php');
        die();
        break;
}

Note that this alone isn't enough to be secure. In file1.php and file2.php you must also call session_start() and carry out a similar check that the user is allowed to view this page, before displaying the page content.

session_start();
if($_SESSION['username'] == 'a')
   header('Location: pageA.php');
else
   header('Location: pageB.php');

You may want to read the PHP.net documention on session_start().

Basically, every page will start with session_start() to initiate the PHP session. After that, you have access to the global $_SESSION[] array which you can use to store and read data.

For example, you could store the username in the session during the login process:

$_SESSION['username'] = 'a';

Then, in your other pages, you would read the session username, find out the username and do proper handling:

if (isset($_SESSION['username']))
{
    header("Location: newlocation.php");
}

Just like quantumSoup's code but He has made a simple error, use this:

session_start();

// ...

if ($_SESSION['username'] == 'a') { header("Location: ./page_a"); } else if ($_SESSION['username'] == 'b') { header("Location: ./page_b"); } else { header("Location: ./otherpage"); }