Changing number of articles in RSS feed in PHP

I’m making a template for a newsletter and I want it to only pull the last 5 articles from my RSS feed. I don’t want to change the number of articles in my RSS feed in WordPress though, because I want 20 showing in some other areas.

Right now I’ve got:

<?php
   $news = simplexml_load_file('https://mysite.com/rss2');

    foreach($news->channel->item as $item) {
                echo "<a href='$item->link'><strong>" . $item->title . "</strong></a><br />";
	echo $item->description;

            }

            ?>

Is there a way to only pull 5 articles instead of the whole RSS feed? Like having the RSS feed URL be https://mysite.com/rss2?=last5 (obviously bogus).

Or do I need to rework the foreach loop? Not a PHP programmer, so it took a ridiculous amount of time to figure out this simple one ?? If so, please instruct on how to do a loop for 5 in the example above.

Thanks for any help you can give!