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   1  <?php
   2  /**
   3   * Copyright Zikula Foundation 2009 - Zikula Application Framework
   4   *
   5   * This work is contributed to the Zikula Foundation under one or more
   6   * Contributor Agreements and licensed to You under the following license:
   7   *
   8   * @license GNU/LGPLv3 (or at your option, any later version).
   9   * @package Zikula
  10   *
  11   * Please see the NOTICE file distributed with this source code for further
  12   * information regarding copyright and licensing.
  13   */
  14  
  15  /**
  16   * Smarty modifier format an issue date for an atom news feed.
  17   *
  18   * Example
  19   *
  20   *   {$MyVar|updated}
  21   *
  22   * @param array $string The contents to transform.
  23   *
  24   * @return       string   the updated output
  25   */
  26  function smarty_modifier_updated($string)
  27  {
  28      global $atom_feed_lastupdated;
  29  
  30      $timestamp = strtotime($string);
  31  
  32      if (!isset($atom_feed_lastupdated) || $timestamp > $atom_feed_lastupdated) {
  33          $atom_feed_lastupdated = $timestamp;
  34      }
  35  
  36      return strftime('%Y-%m-%dT%H:%M:%SZ', $timestamp);
  37  }