[PHP]
RewriteEngine ON
RewriteBase /

RewriteCond %{ENV:REDIRECT_STATUS} ^$
##using THE_REQUEST variable for condition check.
RewriteCond %{THE_REQUEST} \s/([^.]*)\.php/?\s [NC]
##Performing external redirect here.
RewriteRule ^  %1? [R=301,L]

##Performing rewrite for non-existing pages.
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{DOCUMENT_ROOT}/$1.php -f
RewriteRule ^(.*)/?$ /$1.php [QSA,L]
[/PHP]