<?php 
 
  /* 
      Runs from a directory containing files to provide an 
      RSS 2.0 feed that contains the list and modification times for all the 
      files. 
  */ 
 
  require_once('Rss.php'); 
  $rss = new Rss(); 
 
  function get_m_time_dir($path){ 
    $directory = new RecursiveDirectoryIterator( 
      $path, 
      FilesystemIterator::KEY_AS_PATHNAME | 
      FilesystemIterator::CURRENT_AS_FILEINFO | 
      FilesystemIterator::SKIP_DOTS 
    ); 
    $iterator = new RecursiveIteratorIterator( 
      $directory, 
      RecursiveIteratorIterator::SELF_FIRST 
    ); 
    $resultFile = $iterator->current(); 
    foreach($iterator as $file) { 
      if ($file->getMtime() > $resultFile->getMtime()) { 
        $resultFile = $file; 
      } 
    } 
    return $resultFile->getMtime(); 
  } 
 
  $lastFile = get_m_time_dir('./content/'); 
 
  header('Content-type: text/xml'); 
 
  if(file_exists('rss_feed.xml') && (filemtime('rss_feed.xml') >= $lastFile)){ 
 
    $xmlRss = file_get_contents('rss_feed.xml'); 
    echo $xmlRss; 
 
  } else { 
 
    echo $rss->generateFeed(); 
 
  } 
 
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