What are the potential pitfalls of using RewriteCond and RewriteRule in PHP for URL redirection?

Potential pitfalls of using RewriteCond and RewriteRule in PHP for URL redirection include incorrect regular expressions that can lead to unintended redirections, conflicts with existing rewrite rules, and performance issues if too many rules are used. To avoid these pitfalls, it is important to thoroughly test and validate the regular expressions used in RewriteCond and RewriteRule, ensure that the rules are not conflicting with each other, and limit the number of rules to only what is necessary.

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