Answers for "htaccess for rewrite rule for .html to access .php file"

remove .php from url

# Apache Rewrite Rules
 <IfModule mod_rewrite.c>
  Options +FollowSymLinks
  RewriteEngine On
  RewriteBase /

# Add trailing slash to url
  RewriteCond %{REQUEST_FILENAME} !-f
  RewriteCond %{REQUEST_URI} !(\.[a-zA-Z0-9]{1,5}|/|#(.*))$
  RewriteRule ^(.*)$ $1/ [R=301,L]

# Remove .php-extension from url
  RewriteCond %{REQUEST_FILENAME} !-d
  RewriteCond %{REQUEST_FILENAME}\.php -f
  RewriteRule ^([^\.]+)/$ $1.php 

# End of Apache Rewrite Rules
 </IfModule>

htaccess redirect to html page

RedirectMatch 301 ^/blog/about /blog/about.html