htaccess drop php for clean SEO friendly url - .htaccess

Question

I'm having trouble dropping the file extension of my webpages. I have a static site of around 10 php files. I do not have any query parameters in the url. I'd like to have SEO friendly urls.
mysite.com/other-errors instead of mysite.com/other-errors.php
I've been searching but none of the entries in my htaccess file are working. This is what i've tired, amongst other version:
RewriteEngine on
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}\.php -f
RewriteRule ^(.*)$ $1.php
RewriteCond %{HTTP_HOST} ^mysite.co.uk [NC]
RewriteRule ^(.*)$ http://www.mysite.co.uk/$1 [L,R=301,NC]
# Redirect HTTPS to HTTP
RewriteCond %{HTTP:X-Forwarded-Proto} =https
RewriteRule ^(.*)$ http://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
I know I can go the other way:
RewriteRule ^home index.php [NC,L]
But I'd have to do this for every php file, which is a little time consuming. This must be possible. Thanks in advance.

Answer 1

I seem to have solved my problem I needed one of the other solutions
I tried with my redirects. Is this the correct way?
RewriteEngine on
RewriteCond %{THE_REQUEST} \s/+(.*?/)?(?:index)?(.*?)\.php[\s?/] [NC]
RewriteRule ^ /%1%2 [R=302,L,NE]
RewriteCond %{HTTP_HOST} ^mysite.co.uk [NC]
RewriteRule ^(.*)$ http://www.mysite.co.uk/$1 [L,R=301,NC]
# Redirect HTTPS to HTTP
RewriteCond %{HTTP:X-Forwarded-Proto} =https
RewriteRule ^(.*)$ http://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
#Permalink
RewriteRule ^home index.php [NC,L]
RewriteRule ^e02-error e02-error.php [NC,L]
RewriteRule ^other-errors other-errors.php [NC,L]
RewriteRule ^setup-and-chemical-balance setup-and-chemical-balance.php [NC,L]