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   $photosize = module::get_var("qrcode_block", "photosize");
   // photosize can be: thumb, resize, file
   // strip the ?m=xxx of the end of the url
   $photo_url = preg_replace('/\?m=.*/', '', $item->resize_url(true));
   // how do I get $item->resize_url(true) to be thumb_url or resize_url or file_url from the $photosize variable?