Ziparchive always includes parent directory

I am trying to zip all files and folder within a folder The structure looks like so:

storage/app/3
 - folder 1
   -file 1
   -file 2
 - folder 2
   -file 3

When I run the zip script I want the zip to be 3.zip with all the folders and files in the next level However I always end up with:

3.zip
 - 3
   - folder 1
   -file 1
   -file 2
   - folder 2
   -file 3

Where I want:

 3.zip
   - folder 1
     -file 1
     -file 2
   - folder 2
     -file 3

The code works on my Linux servers, but on IIS and windows I get the additional level.

This is my code:

 $rootPath = public_path() .'/storage/app/' . $request->course_id . '/';        
 $zip = new ZipArchive();
 $zip->open(public_path() .'/storage/app/' . $request->course_id . '/' . $request->course_id . '.zip', (ZipArchive::CREATE | ZipArchive::OVERWRITE));
    
  $files = new RecursiveIteratorIterator(
                new RecursiveDirectoryIterator($rootPath),
                RecursiveIteratorIterator::LEAVES_ONLY
            );
    
            
  foreach($files as $name => $file)  {  
    if (!$file->isDir() AND (strpos($name, $request->course_id.'.zip') === FALSE)){
      $zip->addFile($file, str_replace("C:sitescnnect-portalpublic/storage/app/","", $file));
     } 
   }

I have tried to exclude the file from the loop by saying ‘if $name == $request->course_id’ skip this but that doesnt work because I dont see $name ever being just the folder name.

Answer

This will extracts the filename from the path.
$zip->addFile($file,basename($file));

And another guess would be that you need to include course_id here also:

  foreach($files as $name => $file)  {  
    if (!$file->isDir() AND (strpos($name, $request->course_id.'.zip') === FALSE)){
      $zip->addFile($file, str_replace("C:sitescnnect-portalpublic/storage/app/3","", $file));
     } 
   }