如何将用户名从SESSION插入数据库

Question

我尝试将醋栗会话中的用户名插入数据库中

我尝试过

<?php
include "logger.php";
$_SESSION['user']; 
$config = parse_ini_file("bd.ini");

$servername = $config["servername"];
$username = $config["username"];
$password = $config["password"];
$dbname = $config["dbname"];

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
mysqli_set_charset($conn,"utf8"); 
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}


$sql = "INSERT INTO classique(utilisateur, date, nbInvite, prix) VALUES (?,?,?,?)";
$stmt = $conn->prepare($sql);
$stmt->bind_param("ssid", $utilisateur, $date, $nbInvite, $prix);
logger($sql); 

$utilisateur = htmlspecialchars($_SESSION['user']);
$date = htmlspecialchars($_GET["date"]);
$nbInvite = htmlspecialchars($_GET["nbInvite"]);
$prix = htmlspecialchars($_GET["total"]);
$stmt->execute();


$conn->close();
header("Location: accueil.php");
?>

，但用户名未插入我的表中 我应该怎么做才能从会话中插入用户名？