php can't read session value

Question

I'm working with a login.php page. when users login successfully, system will save their usernames into session.like below code:

if ($user != null) {
    $_SESSION['username'] = $user["username"];
    $_SESSION['userid'] = $user["id"];
    return 0;
}

Then the page will be located to main.php. Main.php will read the session, like below code:

session_start();
if (isset($_SESSION['username']) == false || empty($_SESSION['username']))
{
    // transfer into login page
}
else
{
    echo $_SESSION['username'];
}

The main page can't read the $_SESSION['username'], the value is null. What should I do now?

Did you put session_start(); on top of the page where you SET the session values. i.e. login.php ? — Hanky Panky
– Hanky Panky, Commented Mar 5, 2013 at 7:50
if (!isset($_SESSION['username']) || empty($_SESSION['username'])) — Dipesh Parmar
– Dipesh Parmar, Commented Mar 5, 2013 at 7:51
try var_dump($_SESSION) before and after SET session values on Login.php file and see what it show. — Imran Khan
– Imran Khan, Commented Mar 5, 2013 at 7:53

Dipesh Parmar · Accepted Answer · 2013-03-05 07:54:10Z

2

You should add session_start() at the $user check condition page.

session_start();
if ($user != null)
{
    $_SESSION['username'] = $user["username"];
    $_SESSION['userid'] = $user["id"];
    return 0;
}

answered Mar 5, 2013 at 7:54

Dipesh Parmar

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10 Comments

Waqar Alamgir Over a year ago

From the code, $user will always be NULL, the upper code is missing!

Dipesh Parmar Over a year ago

@WaqarAlamgir how can you say so.?? or you can say might be $user is null

roast_soul Over a year ago

It works.Is there any shortcut for not writing "session_start()" everywhere? Currently,I write this code in a included file.

Dipesh Parmar Over a year ago

@roast_soul yes you can make one common file which used in every page and include it in index.php file so you don't need to write it over and over again

roast_soul Over a year ago

@Dipesh Parmar:but I have to include it over and over.

|

Sumit Bijvani · Accepted Answer · 2013-03-05 07:56:44Z

1

You Must add session_start() when you use SESSION variable

session_start(); //at the beginning of file 

if ($user != null) {
    $_SESSION['username'] = $user['username'];
    $_SESSION['userid'] = $user['id'];
    return 0;
}

and then

session_start();

if (isset($_SESSION['username'])) {
    // transfer into login page
}
else
{
    echo $_SESSION['username'];
}

answered Mar 5, 2013 at 7:56

Sumit Bijvani

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Comments

Kevin G Flynn · Accepted Answer · 2013-03-05 08:08:22Z

1

If you want to user session variable. you must start session before use session variable.

session_start();
if ($user != null) {
    $_SESSION['username'] = $user["username"];
    $_SESSION['userid'] = $user["id"];
    return 0;
}

answered Mar 5, 2013 at 8:08

Kevin G Flynn

2314 silver badges14 bronze badges

Comments

subh · Accepted Answer · 2013-03-06 06:29:23Z

0

session_start();
if (count($user)>0 and is_array($user)) {
    $_SESSION['username'] = $user["username"];
    $_SESSION['userid'] = $user["id"];

}

answered Mar 6, 2013 at 6:29

subh

787 bronze badges

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