Zip files from URL

Hi;

How can I zip a few files from url?

This doesn't seem to be the right approach:

PHP Code:

$data = array(
'https://s3.amazonaws.com/files/templates/ai/Tactify+Card+Template+NFC+-+QR.ai' => 'NFC-QR-ai',
'https://s3.amazonaws.com/files/templates/ai/Tactify+Card+Template+NFC.ai' => 'NGF-ai');

$this->zip->add_data($data);
$this->zip->download('templates.zip');