ZipArchive is not creating - addFile() returns false - php

Question

I want to zip a file using PHP. The following code works fine with XAMPP on my local machine, but not on hosting site.
First I thouught it was file permission problem, but I changed it to 777 and nothing changed.
Secondly, I read somewhere on Internet that zip extension may not be loaded but funtcion extension_loaded('zip') return true and there is no errors.
Thirdly, I have checked the result of zipArchive funtions - in my case, $zip->open() returns true, $zip->addFile() return false and $zip->close() return true. But zip file isn't created. It seems like permissions issue, but I have set 777 for both .php and .txt file which I want to add to a zip file.
PHP version on my local machine: 7.3.4
PHP version on my hosting provider: 7.3.1
$zip = new ZipArchive();
$DelFilePath="raport_X_.zip";
if(file_exists($_SERVER['DOCUMENT_ROOT']."/www/Rekrutacja/raports/".$DelFilePath)) {
unlink ($_SERVER['DOCUMENT_ROOT']."/www/Rekrutacja/raports/".$DelFilePath);
}
$openResult = $zip->open($_SERVER['DOCUMENT_ROOT']."/www/Rekrutacja/raports/".$DelFilePath, ZIPARCHIVE::CREATE);
$file='BranżowaSzkołaIstopniamechanikpojazdówsamochodowychGIMNAZJUM_RAPORT.txt';
$addResult = $zip->addFile($_SERVER['DOCUMENT_ROOT']."/www/Rekrutacja/raports/".$file,$file);
$closeResult = $zip->close();
$path = 'raports/raport_X_.zip';
$filename = "raport_X_.zip";
if(file_exists($path)){
header("Content-Type:application/zip");
header("Content-Disposition: attachment; filename=".$filename);
header("Cache-control: private");
header('X-Sendfile: '.$path);
readfile($path);
exit;
}
echo '<br>';
if(extension_loaded('zip')){
echo 'Zip extension is loaded <br>';
}
echo 'Open result:';
var_dump($openResult);
echo 'Add error:';
var_dump($addResult);
echo 'Close error:';
var_dump($closeResult);
phpinfo();
?>
I simply want to get a zip with a .txt file in it. I am getting no error, but zip file isn't created. It works on XAMPP, but not on hosting. I wasted a lot of time on it and now I got no idea.