RewriteEngine On
RewriteCond %{THE_REQUEST} ^[A-Z]{3,9}\ /index\.html\ HTTP/
RewriteRule ^index\.html$ http://example.com/ [R=301,L]
RewriteCond %{THE_REQUEST} ^[A-Z]{3,9}\ /index\.php\ HTTP/
RewriteRule ^index\.php$ http://example.com/ [R=301,L]
if( $_SERVER['REQUEST_URI'] == "/index.php" ) {
header( "Location: /", TRUE, 301 );
exit();
}