php directory iterator recursive

$dir = realpath($dir);
// some flags to filter . and .. and follow symlinks
$flags = FilesystemIterator::SKIP_DOTS | FilesystemIterator::FOLLOW_SYMLINKS;

// create a simple recursive directory iterator
$iterator = new RecursiveDirectoryIterator($dir, $flags);

// make it a truly recursive iterator
$iterator = new RecursiveIteratorIterator($iterator, RecursiveIteratorIterator::SELF_FIRST);

// iterate over it
foreach ($iterator as $file)
{
  // do something with $file (a SplFileInfo instance)
  /* @var $file SplFileInfo */
  if ($file->isFile()) {
 
  } elseif ($file->isDir) {
 
  }
}