glob
only works with paths on the server's file system, not URLs.
http://www.website.com/content/big/
may really be /var/www/site/content/big
on the server, and that's the path you need to use.
Staring a path with a /
makes glob look in your root for that folder, and I'm assuming there is no folder called /content/big/
on your server.
Try it like this (using a relative path from the server root):
$images = glob('content/big/'.$item['id'].'.{jpg,jpeg,png,gif}', GLOB_BRACE);
Or use an absolute path:
$images = glob('/var/www/site/content/big/'.$item['id'].'.{jpg,jpeg,png,gif}', GLOB_BRACE);
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