How does using mod_rewrite in PHP affect the visibility of query parameters in the URL and what are the limitations?

When using mod_rewrite in PHP, query parameters in the URL can be hidden or rewritten to appear as part of a clean URL. This can improve the overall appearance and search engine optimization of the website. However, one limitation is that rewriting complex query parameters may require more advanced regular expressions and could potentially impact the readability of the code.

RewriteEngine On
RewriteRule ^products/([0-9]+)/?$ products.php?id=$1 [NC,L]