SEO friendly URL instead of query string .htaccess - php

Question

How can I modify the .htaccess file and get SEO friendly URLS instead of a query string. I want to achieve this 3 goals:
localhost/example/products/ instead of
localhost/example/products-list.php
localhost/example/products/38/ instead of
localhost/example/products.php?id=38
localhost/example/products/38/red/ instead of
localhost/example/products.php?id=38&color=red
On another post #anubhava helped me a lot and this is what I have right now for the second point:
RewriteEngine on
RewriteBase /example
# external redirect from actual URL to pretty one
RewriteCond %{THE_REQUEST} /products(?:\.php)?\?id=([^\s&]+) [NC]
RewriteRule ^ products/%1? [R=302,L,NE]
# internal forward from pretty URL to actual one
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^products/([^/]+)/?$ products.php?id=$1 [L,QSA]
The second point works properly but I want to know where do I have to put the other rules, before or after. I put this right after the other rule, but it's not working because it redirects to the previous url localhost/example/products/38/:
# external redirect from actual URL to pretty one
RewriteCond %{THE_REQUEST} /products(?:\.php)?\?id=([^\s&]+)\?color=([^\s&]+) [NC]
RewriteRule ^ products/%1/%2? [R=302,L,NE]
# internal forward from pretty URL to actual one
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^products/([^/]+)/([^/]+)/?$ products.php?id=$1&color=$2 [L,QSA]

Answer 1

You need new set of rules for 2 parameters:
RewriteEngine on
RewriteBase /example/
# external redirect from actual URL to pretty one
RewriteCond %{THE_REQUEST} /products(?:\.php)?\?id=([^\s&]+)&color=([^\s&]+) [NC]
RewriteRule ^ products/%1/%2/? [R=302,L,NE]
RewriteCond %{THE_REQUEST} /products(?:\.php)?\?id=([^\s&]+)\s [NC]
RewriteRule ^ products/%1/? [R=302,L,NE]
RewriteCond %{REQUEST_FILENAME} -d [OR]
RewriteCond %{REQUEST_FILENAME} -f
RewriteRule ^ - [L]
# internal forward from pretty URL to actual one
RewriteRule ^products/([^/]+)/?$ products.php?id=$1 [NC,L,QSA]
RewriteRule ^products/([^/]+)/([^/]+)/?$ products.php?id=$1&color=$2 [NC,L,QSA]
RewriteRule ^products/?$ products-list.php [L,NC]