You are not logged

Hello, il my page have this (work for Amember V3)
But in V4 i have error "You are not logged"
Have you a idéa ?

<?php
session_start();
$user = $_SESSION['_amember_user'];
if ($user['member_id'] > 0){

} else {
header('Location: /membres/');
}

$par = $user[login] ;
?>

Yes, but it s i dont work
I have uou are not logged

Please, help me.

I just try to connect for the V3, uis going on the protected page, I am logged. The placing of the V3 puts in place the session, but the V4 does not.
Other users have the same concern?

I am find, the
?php
session_start();
$user = $_SESSION['_amember_user'];
if ($user['member_id'] > 0){

don't work witch the new version. But the API Lite is OK