How to use session inside webpages?

Question

I am trouble with session; I know it theoretically but I encountered with it how to use session , transferring username to

Answer 1

After the line

$result=mysql_query($sql);

add

if ($data = mysql_fetch_array($result)) {
    $_SESSION['user'] = $data['usermail'];
}

Now session created.Call this session in jcte/index.php page as:

<?php
session_start();
echo "welcome $_SESSION['user']";
?>

Unset the session in logout.php page as:

<?php
session_start();
unset($_SESSION['user']);
?>

Answer 2

<?php
    session_start();
    $_SESSION['user']="Varma"; //intializing the session['user'];
    echo $_SESSION['user'];   // displaying the data  
    unset($_SESSION['user']); // destroying the session data.
?>

but you have to initialize session_start(); in all web pages where you have need to access that session variables.

Answer 3

Always start session page with session_start().If you want to use session first assign session a value like this :

session_start();
$_SESSION['username'] = 'Mahmood';

And when you want to access get it like this :

echo $_SESSION['username'];
OR
$username = $_SESSION['username'];

And unset this session like this :

unset($_SESSION['username']);

Some Details are here.