Using the new io.collections API

How many times have you written something like the following to recursively traverse directories?

<?php 
  function allClassesIn(&$folder) {
    $files= array();
    while (FALSE !== ($e= $folder->getEntry()) {
      $qualified= $folder->getURI().$e;
      if (is_dir($qualified)) {
        $files= array_merge($files, allClassesIn(new Folder($qualified)));
      } else if (preg_match('/\.class\.php$/', $qualified)) {
        $files[]= $qualified;
      }
    }
    $folder->close();
    return $files;
  }

  $classes= allClassesIn(new Folder('/home/thekid/devel/xp/'));
?>

Using the new io.collections API, you can rewrite the above example to the following:

<?php 
  function allClassesIn(&$collection) {
    $files= array();
    for (
      $i= &new FilteredIOCollectionIterator($collection, new RegexFilter('/\.class\.php$/'), TRUE);
      $i->hasNext(); 
    ) {
      $element= &$i->next();
      $files[]= $element->getURI();
    }
    return $files;
  }

  $classes= allClassesIn(new FileCollection('/home/thekid/devel/xp/'));
?>

• The allClasses() function will work for any IOCollection implementation - e.g., a collection based on a zip archive or a .tar.gz-file.
• If you need more complex matching rules, you can supply your own implementation of the IterationFilter interface (though RegexFilter is currently the only existing implementation, the most common usecases will be covered by new classes soon)

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