It changes to the parent directory
Example
<?php
$fName = “/home/user/test.txt”;
$ftpId = ftp_connect(‘ftp.phpcodez.com’);
$login_result = ftp_login($ftpId, ‘anonymous’, ‘user@phpcodez.com’);
ftp_chdir($ftpId, ‘phpcodez’);
ftp_cdup($ftpId) or die(“Failed”);
echo ftp_pwd($ftpId);
?>