(PHP 5 >= 5.2.0, PHP 7, PECL zip >= 1.8.0)
ZipArchive::addEmptyDir — Add a new directory
public ZipArchive::addEmptyDir ( string $dirname [, int $flags = 0 ] ) : bool
Adds an empty directory in the archive.
dirname
The directory to add.
flags
 Bitmask consisting of ZipArchive::FL_ENC_GUESS, ZipArchive::FL_ENC_UTF_8, ZipArchive::FL_ENC_CP437. The behaviour of these constants is described on the ZIP constants page. 
 Returns true on success or false on failure. 
| Version | Description | 
|---|---|
| 8.0.0 / 1.18.0 |  flags was added.  |  
Example #1 Create a new directory in an archive
<?php
$zip = new ZipArchive;
if ($zip->open('test.zip') === TRUE) {
    if($zip->addEmptyDir('newDirectory')) {
        echo 'Created a new root directory';
    } else {
        echo 'Could not create the directory';
    }
    $zip->close();
} else {
    echo 'failed';
}
?> 
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Licensed under the Creative Commons Attribution License v3.0 or later.
    https://www.php.net/manual/en/ziparchive.addemptydir.php