PHP: Get username from session

Basically, just write it inside like

session_start();
echo $_SESSION['username']; 

or

 echo $_SESSION['password'];

A brief explanation of how sessions work.

first you start the session and assign any value to a session ex:

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

then echoing works like:

echo $_SESSION['username']; // will echo out 'jonh'

note session_start() must be shared in-between the pages you want to use the session

You have session_start(); on top ?

In the login function you should write the username to the session after a successful login.

//instantiate if needed
include("class.login.php");
$log = new logmein();
$log->encrypt = true; //set encryption
if($_REQUEST['action'] == "login"){
    if($log->login("logon", $_REQUEST['username'], $_REQUEST['password']) == true){
         //do something on successful login
         $_SESSION['username'] = $_REQUEST['username'];
    }else{
         //do something on FAILED login
    }
}

<?php
include('db.php');
session_start();
$name=$_POST['name'];
$password=$_POST['password'];
echo $sql="SELECT * FROM register WHERE (name='$name' OR email='$name') AND password='$password'";
$result=mysqli_query($conn,$sql);
$num_rows = mysqli_num_rows($result);
if ($num_rows > 0)
 {
    $_SESSION['user']=mysqli_fetch_assoc($result);
    $row = $_SESSION['user'];
    $role = $row['role'];

            if($role == 1)
            {
                header('location:usermanagement.php');
            }
            else{
                header('location:user.php');
            }

}
else
 {

    echo "Wrong Username or Password";
    header('location:login.php');
}
$conn->close();
?>