Encryption for upload helper

I have gotten the do_upload working. But I now realize that the file is being uploaded to the server not the users pc. In my case the data needs to be kept secure during the trip. How can I encrypt the users data?

Perhaps I am doing this all wrong? I need to get data from an xls file into a mysql table. I need to check that the data is in the correct format during this trip. Is there a more direct way of doing this rather than using phpOffice/phpSpreadSheet? The code I am doing is 

PHP Code:

$data = array('upload_data' => $this->upload->data());
$reader = \PhpOffice\PhpSpreadsheet\IOFactory::createReader("Xlsx");
$iRc=$reader->setReadDataOnly(true);
$file = $data["upload_data"]["full_path"];
$spreadsheet = $reader->load($file); 


proof that an old dog can learn new tricks

Specifically I am concerned about XXE injection.

proof that an old dog can learn new tricks

Please Read:

XML External Entity (XXE) Vulnerabilities and How to Fix Them

You really should upgrade your app to CodeIgniter 4 because of security reasons.

What did you Try? What did you Get? What did you Expect?

Joined CodeIgniter Community 2009.  ( Skype: insitfx )