Programmatic File Retrieval without a Form

http://cakephp-upload.readthedocs.org/en/latest/examples.html#programmatic-file-retrieval-without-a-form

Can someone tell me what it means and how to set up $image_url, whether it 
is a local file or from a remote server?

When I save the article, at the same time save the images in attachmen 
model.

Relationships: Article hasMany Attachments



<?php
$this->Article->set(array('file' => *$image_url*)); // ?????
$this->Article->save();
?>

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