How to make a redirect if the original URI has a GET parameter (that is, a question mark)?

Question

htaccess

Here is the redirect itself.

RewriteRule ^\?p=(\d+)$ index\.php/$1 [NC,L,R]

If you write a question mark in the second rewrite parameter, then there are no problems with this, it does not give errors and the GET parameter is passed, for example

RewriteRule ^ (\d+)$ index\.php/\?p=$1 [NC,L,R] (this is how it works, but I need it the other way around)

Answer 1

How mod_rewrite actually works .
Only the path to the requested file is passed to RewriteRule, and GET parameters should be looked for in %{QUERY_STRING}.

RewriteCond %{QUERY_STRING} (?:^|&)p=(\d+)(?:$|&)
RewriteRule ^ /index.php/%1? [L,R]