PHP username welcome message not working [closed] - php

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I'm trying to dislplay a "welcome, username !" , but it's always dislaying "not working".
How can i fix this ?
This is the index_l.php page content:
<?php
if(isset($_SESSION['username']) && $_SESSION['username']) {
echo "Welcome, ".$_SESSION['username']."!";
}
else{
echo "not working";
}
?>
This is the login script:
<?php
include('connect.php');
// username and password sent from form
$username=$_POST['username'];
$password=$_POST['password'];
// To protect MySQL injection (more detail about MySQL injection)
$username = stripslashes($username);
$password = stripslashes($password);
$username = mysql_real_escape_string($username);
$password = mysql_real_escape_string($password);
$sql="SELECT * FROM members WHERE username='$username' and password='$password'";
$result=mysql_query($sql);
// Mysql_num_row is counting table row
$count=mysql_num_rows($result);
// If result matched $username and $password, table row must be 1 row
if($count==1){
// Register $username, $password and redirect to file "login_success.php"
$_SESSION['username'];
$_SESSION['loggedin'] = true;
header("location:index_l.php");
}
else {
echo "Problem";
}
?>

Answer 1

Your code doesn't work because $_SESSION['username'] doesn't have a value:
$_SESSION['username'];
You might want to set it the value of $username:
$_SESSION['username'] = $username;

Answer 2

session variable does not have a value.
$_SESSION['username']
Also,
You have to add
session_start();
at the very beginning in both files index_l.php and login script