How can clean URLs be implemented in PHP for better user experience and SEO benefits?

Clean URLs can be implemented in PHP by using URL rewriting techniques in the .htaccess file. This can improve user experience by making URLs more readable and memorable, as well as benefiting SEO by making URLs more search engine-friendly.

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