问如何在PHP中仅限制一个目录的会话？

EN

// Assuming you've saved an admin flag in session
// and the user request URI doesn't contain admin/
if ($_SESSION['admin'] === TRUE && !preg_match('/admin\//' $_SERVER['REQUEST_URI'])) {
  // redirect into the admin/ area
  header("Location: http://example.com/admin");
  exit();
}

if ((!isset($_SESSION['admin'] || $_SESSION['admin'] === FALSE)  && preg_match('/admin\//' $_SERVER['REQUEST_URI'])) {
  // redirect out of the admin/ area
  header("Location: http://example.com/");
  exit();
}

$_SESSION['path/to/admin']['var1'] = 'value1';
$_SESSION['path/to/admin']['var2'] = 'value2';