CODEWITHSUNDEEP
phpsession
user5005297
user5005297

Reputation:

PHP How to display page based on session?

I am making a website. Most of it is available to anybody visiting the site, but a small portion of it requires you to register to view. I have set up the login with Sessions. After someone logs in, it sets this:

$_SESSION['login'] = TRUE;

In one of the exclusive pages, at the top of the code before the content, I have written 

if ($_SESSION['login'] == FALSE) {
    header("loginpage.php");
}

However, if somebody is not logged in, that variable does not exist, and I end up with an error. Is there any other way to check if somebody is logged in? I would like something similar to what I already have, because I don't want to have to change everything.

Upvotes: 0

Views: 1432

Answers (4)

Surreal Dreams
Surreal Dreams

Reputation: 26380

Do you have a script that always runs before each page executes? If not, this is a great place to set up any utility functions or initialize variables, like $_SESSION['login']. You can set a default false value for $_SESSION['login'] there. Then you have a reliable default value, which is a good practice for a variable that's important, like this one.

You could use this to check if it's set and assign a default:

//Right after starting the session
if (!isset($_SESSION['login'])) {
    $_SESSION['login'] = false;
}

If it's already got a value, this will be skipped.

You can also add an @ before a variable when you want to use it but you can't be sure it exists. This will suppress warnings about the existence of the variable, but I think it's better to know what the default value should be. Sometimes it's useful to get those warnings.

Upvotes: 0

Jose Manuel Abarca Rodríguez
Jose Manuel Abarca Rodríguez

Reputation: 10381

Simple solution : in the first page (or first script) of your website, create the session variable with value "false" :

<?php
session_start();
$_SESSION['login'] = FALSE;
?>

And, after some successfully logins you change the value to TRUE (as you are already doing) :

$_SESSION['login'] = TRUE;

This way the session variable will always exist, and you will not have problems with "unset" variables.

Upvotes: 0

Derek
Derek

Reputation: 3016

if(!@$_SESSION['login'])
{
  header("location: logingpage.php");
  exit();
}

Upvotes: 0

Matteo Basso
Matteo Basso

Reputation: 2704

You can use isset function to determine if a variable is set and is not null.

if (!isset($_SESSION['login']) || $_SESSION['login'] == FALSE) {
    //user isn't logged in
    header("loginpage.php");
}else{
    //user is logged
}

Check the manual.

Upvotes: 1

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