Zip function not working properly on server - php

Question

Any ideas on why this is perfectly working in my localhost but not in the server where I uploaded it to? In the server, it creates the zip but does not create the folders, it puts all the files inside the .zip, with no folders distinction.
function rzip($source, $destination) {
// create object
$zip = new ZipArchive();
// open archive
if ($zip->open($destination, ZIPARCHIVE::CREATE) !== TRUE) {
die ("Could not open archive");
}
$iterator = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($source));
foreach ($iterator as $key=>$value) {
$new_filename = substr($key,strrpos($key,"/") + 1);
$zip->addFile(realpath($key), $new_filename) or die ("ERROR: Could not add file: $key");
}
$zip->close();
}

Answer 1

You are mis-using (or not using) the RecursiveDirectoryIterator in places.
The first point is that you will iterate over the dot folders (. and ..) which is probably undesired; to stop this, use the SKIP_DOTS flag.
Next, there are tools to get the file's path relative to the main directory being iterated over and to get the real path too; using the getSubPathname() and getRealpath() methods, respectively.
$iterator = new RecursiveIteratorIterator(new RecursiveDirectoryIterator(
$source, RecursiveDirectoryIterator::SKIP_DOTS));
foreach ($iterator as $key => $value) {
$localname = $iterator->getSubPathname();
$filename = $value->getRealpath();
$zip->addFile($filename, $localname) or die ("ERROR: Could not add file: $key");
}
The above is only an answer because it's too long for a comment. Nothing above answers why, "this is perfectly working in my localhost but not in the server".