我有一個名為的用戶表id_role。默認情況下id_role，3為所有新用戶分配值。任何需要更高級別特權的用戶，我都會手動將它們更新為2foradministrator和1for super_admin。問題是id_role仍然值得上次注冊的價值，我不明白為什么。如果我不添加新用戶id_role，它將始終為1，每個人都將登錄superadmin；如果我添加新用戶，id_role則將為3，每個人（甚至是admin）都將以基本用戶身份登錄。這是我的基本代碼：<?phpsession_start();$Nom = $_POST["Nom"];$mdp = $_POST["mdp"];//$id_role = $_POST["id_role"];try{    $bdd = new PDO('mysql:host=localhost;dbname=azer', 'root', '', array(PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION));} catch(Exception $e) {    die("acces imlpossible");}$st = $bdd->query("SELECT * FROM membre WHERE Nom='".$Nom."'")->fetch();$mangetesmorts = $bdd->query("SELECT * FROM membre WHERE id_role");if (password_verify($mdp, $st['mdp'])) {    $_SESSION['Nom'] = $Nom;    $_SESSION['activite'] = $st['activite'];    //$_SESSION['id_role'] = $mangetesmorts['id_role'];    //var_dump($_SESSION['id_role']);    //print_r($id_role);    while ($donne = $mangetesmorts->fetch()) {        if ($_SESSION['activite'] =='cricket') {            header("Location: cricket.php");        } elseif ($_SESSION['activite'] == 'foot') {            header("Location: foot.php");        } elseif (($donne['id_role'] == 2)) {            header("Location: admin.php");        } elseif ($donne['id_role'] == 1) {            header("Location: admin_super.php");        } else {            header("Location: index2.php");}        }   }這就是我嘗試過的：<?phpsession_start();$Nom = $_POST["Nom"];$mdp = $_POST["mdp"];//$id_role = $_POST["id_role"];try{    $bdd = new PDO('mysql:host=localhost;dbname=azer', 'root', '', array(PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION));} catch (Exception $e) {    die("acces imlpossible");}$st = $bdd->query("SELECT * FROM membre WHERE Nom='".$Nom."'")->fetch();$mangetesmorts = $bdd->query("SELECT * FROM membre WHERE id_role");if (password_verify($mdp, $st['mdp'])) {    $_SESSION['Nom'] = $Nom;    $_SESSION['activite'] = $st['activite'];    //$_SESSION['id_role'] = $mangetesmorts['id_role'];    //var_dump($_SESSION['id_role']);