PHP: Recursively Backup Files & Folders to ZIP-File

backup.php

<?php
/*
 * PHP: Recursively Backup Files & Folders to ZIP-File
 * MIT-License - 2012-2018 Marvin Menzerath
*/

// Make sure the script can handle large folders/files
ini_set('max_execution_time', 600);
ini_set('memory_limit', '1024M');

// Start the backup!
zipData('/path/to/folder', '/path/to/backup.zip');
echo 'Finished.';

// Here the magic happens :)
function zipData($source, $destination) {
	if (extension_loaded('zip')) {
		if (file_exists($source)) {
			$zip = new ZipArchive();
			if ($zip->open($destination, ZIPARCHIVE::CREATE)) {
				$source = realpath($source);
				if (is_dir($source)) {
					$files = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($source, RecursiveDirectoryIterator::SKIP_DOTS), RecursiveIteratorIterator::SELF_FIRST);
					foreach ($files as $file) {
						$file = realpath($file);
						if (is_dir($file)) {
							$zip->addEmptyDir(str_replace($source . '/', '', $file . '/'));
						} else if (is_file($file)) {
							$zip->addFromString(str_replace($source . '/', '', $file), file_get_contents($file));
						}
					}
				} else if (is_file($source)) {
					$zip->addFromString(basename($source), file_get_contents($source));
				}
			}
			return $zip->close();
		}
	}
	return false;
}
?>

I cant get it to work. is this not working with newer PHP versions? 7.2?

is this code can create zip up 10 GB files into backup of any sites ?