php - 在php中创建zip文件夹时如何授予777权限

Question

我正在尝试创建一个 zip 文件夹，但我无法授予 777 权限。请帮我解决这个问题。

这是我的源代码：

 $files = ['13150925581920IMG_0009.PNG','1328684363792113286843637921IMG_0009.PNG'];
 $random = rand(1111111111,9999999999);
 $zipname = 'photos_'.$random.'.zip';

 $zip = new ZipArchive;
 $zip->open($zipname, ZipArchive::CREATE);
 chmod($zipname, 777);

 foreach ($files as $file) {
   if(file_exists($file)){
     $zip->addFromString(basename($file),  file_get_contents($file));  
   }
 }

 $zip->close();

 header('Content-Type: application/zip');
 header('Content-disposition: attachment; filename='.$zipname);
 header('Content-Length: ' . filesize($zipname));
 readfile($zipname);

 header("Content-type: application/zip"); 
 header("Content-Disposition: attachment; filename=$zipname");
 header("Content-length: " . filesize($zipname));
 header("Pragma: no-cache"); 
 header("Expires: 0"); 
 readfile("$zipname");