zip folder in php

zip-folder.php

<?php
$zip = new ZipArchive;
$bkfile = '../export/backup/backup-source-' . date('dd-mm-yy') . '.zip';
$zip->open($bkfile, ZipArchive::CREATE);
$iterator = new RecursiveIteratorIterator(new RecursiveDirectoryIterator("../../"));

// iterate over the directory
// add each file found to the archive
foreach ($iterator as $key => $value) {
    if (in_array(substr($key, strrpos($key, '/') + 1), array('.', '..')))
        continue;
    $zip->addFile(realpath($key), $key) or die("ERROR: Could not add file: $key");
}
$zip->close();