<?
define('PREG_FIND_RECURSIVE', 1);
define('PREG_FIND_DIRMATCH', 2);
define('PREG_FIND_FULLPATH', 4);
define('PREG_FIND_NEGATE', 8);
define('PREG_FIND_DIRONLY', 16);
define('PREG_FIND_RETURNASSOC', 32);
define('PREG_FIND_SORTDESC', 64);
define('PREG_FIND_SORTKEYS', 128);
define('PREG_FIND_SORTBASENAME', 256);   # requires PREG_FIND_RETURNASSOC
define('PREG_FIND_SORTMODIFIED', 512);   # requires PREG_FIND_RETURNASSOC
define('PREG_FIND_SORTFILESIZE', 1024);  # requires PREG_FIND_RETURNASSOC
define('PREG_FIND_SORTDISKUSAGE', 2048); # requires PREG_FIND_RETURNASSOC

// PREG_FIND_RECURSIVE   - go into subdirectorys looking for more files
// PREG_FIND_DIRMATCH    - return directorys that match the pattern also
// PREG_FIND_DIRONLY     - return only directorys that match the pattern (no files)
// PREG_FIND_FULLPATH    - search for the pattern in the full path (dir+file)
// PREG_FIND_NEGATE      - return files that don't match the pattern
// PREG_FIND_RETURNASSOC - Instead of just returning a plain array of matches,
//                         return an associative array with file stats
//
// You can also request to have the results sorted based on various criteria
// By default if any sorting is done, it will be sorted in ascending order.
// You can reverse this via use of:
// PREG_FIND_SORTDESC    - Reverse order of sort
// PREG_FILE_SORTKEYS    - Sort on the keyvalues or non-assoc array results
// The following sorts *require* PREG_FIND_RETURNASSOC to be used as they are
// sorting on values stored in the constructed associative array
// PREG_FIND_SORTBASENAME - Sort the results in alphabetical order on filename
// PREG_FIND_SORTMODIFIED - Sort the results in last modified timestamp order
// PREG_FIND_SORTFILESIZE  - Sort the results based on filesize
// PREG_FILE_SORTDISKUSAGE - Sort based on the amount of disk space taken
// to use more than one simply seperate them with a | character

// Search for files matching $pattern in $start_dir.
// if args contains PREG_FIND_RECURSIVE then do a recursive search
// return value is an associative array, the key of which is the path/file
// and the value is the stat of the file.
Function preg_find($pattern, $start_dir='.', $args=NULL) {

  static $depth = -1;
  ++$depth;

  $files_matched = array();

  $fh = opendir($start_dir);

  while (($file = readdir($fh)) !== false) {
    if (strcmp($file, '.')==0 || strcmp($file, '..')==0) continue;
    $filepath = $start_dir . '/' . $file;
    if (preg_match($pattern,
                   ($args & PREG_FIND_FULLPATH) ? $filepath : $file)) {
      $doadd =    is_file($filepath)
               || (is_dir($filepath) && ($args & PREG_FIND_DIRMATCH))
               || (is_dir($filepath) && ($args & PREG_FIND_DIRONLY));
      if ($args & PREG_FIND_DIRONLY && $doadd && !is_dir($filepath)) $doadd = false;
      if ($args & PREG_FIND_NEGATE) $doadd = !$doadd;
      if ($doadd) {
        if ($args & PREG_FIND_RETURNASSOC) { // return more than just the filenames
          $fileres = array();
          if (function_exists('stat')) {
            $fileres['stat'] = stat($filepath);
            $fileres['du'] = $fileres['stat']['blocks'] * 512;
          }
          if (function_exists('fileowner')) $fileres['uid'] = fileowner($filepath);
          if (function_exists('filegroup')) $fileres['gid'] = filegroup($filepath);
          if (function_exists('filetype')) $fileres['filetype'] = filetype($filepath);
          if (function_exists('mime_content_type')) $fileres['mimetype'] = mime_content_type($filepath);
          if (function_exists('dirname')) $fileres['dirname'] = dirname($filepath);
          if (function_exists('basename')) $fileres['basename'] = basename($filepath);
          if (isset($fileres['uid']) && function_exists('posix_getpwuid')) $fileres['owner'] = posix_getpwuid ($fileres['uid']);
          $files_matched[$filepath] = $fileres;
        } else
          array_push($files_matched, $filepath);
      }
    }
    if ( is_dir($filepath) && ($args & PREG_FIND_RECURSIVE) ) {
      $files_matched = array_merge($files_matched,
                                   preg_find($pattern, $filepath, $args));
    }
  }

  closedir($fh); 

  // Before returning check if we need to sort the results.
  if (($depth==0) && ($args & (PREG_FIND_SORTKEYS|PREG_FIND_SORTBASENAME|PREG_FIND_SORTMODIFIED|PREG_FIND_SORTFILESIZE|PREG_FIND_SORTDISKUSAGE)) ) {
    $order = ($args & PREG_FIND_SORTDESC) ? 1 : -1;
    $sortby = '';
    if ($args & PREG_FIND_RETURNASSOC) {
      if ($args & PREG_FIND_SORTMODIFIED)  $sortby = "['stat']['mtime']";
      if ($args & PREG_FIND_SORTBASENAME)  $sortby = "['basename']";
      if ($args & PREG_FIND_SORTFILESIZE)  $sortby = "['stat']['size']";
      if ($args & PREG_FIND_SORTDISKUSAGE) $sortby = "['du']";
    }
    $filesort = create_function('$a,$b', "\$a1=\$a$sortby;\$b1=\$b$sortby; if (\$a1==\$b1) return 0; else return (\$a1<\$b1) ? $order : 0- $order;");
    uasort($files_matched, $filesort);
  }
  --$depth;
  return $files_matched;
}
?>
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<p><span style="color: #333333; font-size: small;"><span style="font-family: helvetica;">Lagelands is a tutor-supported online course for beginning learners of Dutch for which no prior knowledge of Dutch is required. The course consists of ten chapters. Each chapter includes reading and listening texts (mainly dialogues), accompanied by comprehension and vocabulary exercises. There is also a grammar section (with a link to a separate reference grammar of Dutch), and a section on pronunciation. Each chapter also has a number of general exercises to practise listening, writing and speaking. Many exercises are self-correcting, but some need to be mailed to the course tutor for feedback. Each chapter ends with a revision section and a comprehensive final assignment which is sent to the tutor for feedback. The reference grammar contains further self-correcting exercises which are freely available for private study.<br /><br /> Click <a href="../index.php?module=pagesetter&amp;func=viewpub&amp;tid=3&amp;pid=37">here</a> for more information about the course.</span></span></p>
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