TYPO3 - felogin -> redirect to previousely visited page

typo3_felogin_redirect_to_previousely_visited_page.php

<?php
// From: Newslist en - 25.4.2014
// http://wiki.typo3.org/Felogin#Users_manual

// Add this line in my ext_localconf:
$GLOBALS['TYPO3_CONF_VARS']['EXTCONF']['felogin']['login_confirmed'][] = 'tx_myextension->myfunction';

// And in my class extension:
class tx_myextension extends {
  public function myfunction() {
    $my_new_url = "http://www.google.cat";
    header("Location $my_new_url");
    exit();
  }
}
?>