connect_errno) { die('DB connection failed: '.$mysqli->connect_error); }
$mysqli->set_charset('utf8mb4');
function pdo() { // simple PDO for convenience if needed
static $pdo = null;
if ($pdo) return $pdo;
$dsn = 'mysql:host='.DB_HOST.';dbname='.DB_NAME.';charset=utf8mb4';
$pdo = new PDO($dsn, DB_USER, DB_PASS, [PDO::ATTR_ERRMODE=>PDO::ERRMODE_EXCEPTION]);
echo $pdo;
return $pdo;
}
function e($s){
return htmlspecialchars($s ?? '', ENT_QUOTES, 'UTF-8');
}
function is_admin(){
return isset($_SESSION['admin_id']);
}
function require_admin(){
if(!is_admin()) {
echo "";
exit;
}
}
function is_student(){
return isset($_SESSION['student_id']);
}
function require_student(){
if(!is_student()) {
echo "";
// header('Location: student/login.php'); exit;
}
}
?>