I am using htaccess to redirect my URL and to hide .PHP extension but it take to a unknown folder following code i have used

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

    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteCond %{REQUEST_FILENAME} !-l

    RewriteRule ^index$ index.php [L]

重定向时，显示以下错误

Not Found
    The requested URL /abc/index was not found on this server.
    Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

我的网站名称与abc.com类似，但它显示上述错误，包含未知文件夹/ abc / index

php .htaccess