(PHP >= 5.3.0, PECL phar >= 2.0.0)
PharData::addEmptyDir — Add an empty directory to the tar/zip archive
$dirname
   )With this method, an empty directory is created with path dirname. This method is similar to ZipArchive::addEmptyDir().
dirnameThe name of the empty directory to create in the phar archive
no return value, exception is thrown on failure.
Example #1 A PharData::addEmptyDir() example
<?php
try {
    $a = new PharData('/path/to/my.tar');
    $a->addEmptyDir('/full/path/to/file');
    // demonstrates how this file is stored
    $b = $a['full/path/to/file']->isDir();
} catch (Exception $e) {
    // handle errors here
}
?>