我創建了鏈接到數據庫的登錄頁面，我想根據用戶角色將用戶重定向到不同的主頁，如果 1 在登錄后重定向到 indexorg.php，如果 0 在登錄后重定向到 indexpart.php，但它不起作用，所有頁面都被重定向到同一頁面indexorg.php或indexpart.php（代碼中的第一個）這是我的代碼<?php// Initialize the sessionsession_start(); // Check if the user is already logged in, if yes then redirect him to welcome pageif(isset($_SESSION["loggedin"]) && $_SESSION["loggedin"] === true){    if ($_SESSION["user_role"] = "1") {        $redirect = 'indexorg.php';    } else if ($_SESSION["user_role"] == "0") {        $redirect = 'indexpart.php';    }         header('Location: ' . $redirect);        //header("location: index.php");    exit;} // Include config filerequire "config.php"; // Define variables and initialize with empty values$email = $password = "";$email_err = $password_err = ""; // Processing form data when form is submittedif($_SERVER["REQUEST_METHOD"] == "POST"){     // Check if email is empty    if(empty(trim($_POST["email"]))){        $email_err = "Please enter email.";    } else{        $email = trim($_POST["email"]);    }        // Check if pass is empty    if(empty(trim($_POST["password"]))){        $password_err = "Please enter your password.";    } else{        $password = trim($_POST["password"]);    }        // Validate credentials    if(empty($email_err) && empty($password_err)){        // Prepare a select statement        $sql = "SELECT user_role, user_id, email, password  FROM users WHERE email = :email";                if($stmt = $pdo->prepare($sql)){            // Bind variables to the prepared statement as parameters            $stmt->bindParam(":email", $param_email, PDO::PARAM_STR);                        // Set parameters            $param_email = trim($_POST["email"]);