Function Redirect Admin WHMC

// Redirect Admin

function redirect_admin() {

   $home_site_url = 'http://www.sitoweb.com';

  $pages = array('clientarea.php', 'cart.php', 'affiliates.php', 'register.php', 'login.php');

  foreach($pages as $pages) {

    if (strpos($page_complete_url, $pages)) {

        $client_area = true;

        break;
    }
  }

if(!$client_area) {

  header("location: $home_site_url");

}

// Call Function in WHMCS in header.tpl

{redirect_admin}