(PHP 5 >= 5.3.0, PHP 7, PECL phar >= 2.0.0)
PharData::addEmptyDir — Add an empty directory to the tar/zip archive
public PharData::addEmptyDir ( string $dirname ) : void
 With this method, an empty directory is created with path dirname. This method is similar to ZipArchive::addEmptyDir(). 
dirname
The 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
}
?> 
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    https://www.php.net/manual/en/phardata.addemptydir.php