Wordpress 301 redirect using functions.php

functions.php

add_action('template_redirect','my_template_redirect');
function my_template_redirect() {
  $redirect_to = false;
  list($url_path,$params) = explode('?',$_SERVER['REQUEST_URI']);
  $path_parts = explode('/',trim($url_path,'/'));
  switch ($path_parts[0]) {
    case 'wrongpage1.html':
      $redirect_to = '/';
      break;
    case 'wrongpage2.php':
      $redirect_to = '/new-page/';
      break;
    case 'wrongpage.htm':
      $redirect_to = '/news';
      break;
  }
  if ($redirect_to) {
    wp_safe_redirect($redirect_to,301);
      exit();
  }
}