What are the potential issues that can arise when using mod_rewrite to rewrite URLs in PHP?

One potential issue that can arise when using mod_rewrite to rewrite URLs in PHP is that the rewritten URLs may not work as expected due to incorrect configuration or conflicting rules. To solve this issue, it is important to carefully test and debug the rewrite rules to ensure they are functioning correctly.

RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?url=$1 [QSA,L]