如何在功能中设置SESSION，以便在任何地方使用此SESSION？ 这不行

Question

I've got a problem with a SESSION, inside a function.

How can I set $_SESSION['idUser'] = $result['idUser']; to a SESSION, which I can use for upcoming activity's.

    <?php

// Session starts
    session_start();


    class DB_Functions {

        public function getUserByEmailAndPassword($email, $password) {
            $result = mysql_query("SELECT * FROM User WHERE emailadress = '" . $email . "'") or die(mysql_error());
            // check for result 
            $no_of_rows = mysql_num_rows($result);
            if ($no_of_rows > 0) {
                $result = mysql_fetch_array($result);



//This is the session I want to use

$_SESSION['idUser'] = $result['idUser'];

                    return $result;

Answer 1

Assuming this is just a snippet of a larger class, I see no reason why this line:

$_SESSION['idUser'] = $result['idUser'];

wouldn't work (again assuming that $result['idUser'] contains a value). Ensure that you have session_start(); called on all pages that you want to use the global session variable.

Answer 2

Delete the space before <?php . Before session_start() there shouldn't be any output.

Answer 3

I suggest using the following in the first place:

Session Management Library

I highly recommend it.

1. Like you wanted, you could use it everywhere.
2. It'll keep you from using super globals like $_SESSION (not easy to debug)
3. Make your code more testable and it'll alleviate you from having to manage sessions manually.

Example code:

use Symfony\Component\HttpFoundation\Session\Session;

$session = new Session();
$session->start();

// set and get session attributes
$session->set('name', $result['id_user']);
$session->get('name'); //Easy to get 'id_user' in another page.

//Other examples: 
// set flash messages (appears only once, for warnings/alerts)
$session->getFlashBag()->add('notice', 'Profile updated');

// retrieve messages
foreach ($session->getFlashBag()->get('notice', array()) as $message)
{
    echo '<div class="flash-notice">'.$message.'</div>';
}

If you like like what you see here are the links:

Download

Install Instructions

Warning

Make sure your PHP session isn't already started before using the Session class. If you have a legacy session system that starts your session, see Legacy Sessions .