How to Redirect .php to .html via .htaccess?

Please get the 301 redirection code for .php to .html via .htaccess:

RewriteEngine on
RewriteCond %{HTTP_HOST} ^yourwebsite\.com$ [NC]
RewriteRule ^(.*)$ http://www.yourwebsite.com/$1 [R=301,L]

RewriteCond %{THE_REQUEST} \ /(.+)\.php
RewriteRule ^ /%1.html [L,R=301]
RewriteRule ^(.*).html$ $1.php [QSA]

ErrorDocument 404 /404.html