How does the notation www.example.de/seite.php?id=15&page=18 impact SEO and user experience, and what are the implications of converting it to a different URL structure in PHP?

The notation www.example.de/seite.php?id=15&page=18 can negatively impact SEO as it does not provide clear and readable URLs for search engines to crawl. It can also affect user experience by making the URL complex and difficult to remember. Converting it to a more user-friendly URL structure in PHP, such as www.example.de/seite/15/18, can improve SEO and user experience by making the URLs more descriptive and easier to navigate.

RewriteEngine On
RewriteRule ^seite/([0-9]+)/([0-9]+)$ seite.php?id=$1&page=$2 [L]