Deny access multiple .php files with .htaccess?

I want to deny access to multiple PHP files in directory /all/cstl/.

My .htaccess is also stored in this directory.

This is my current code and it's not working.

<Files "\ (config.php|function.php|include.php)">
  Order allow,deny
  Deny from all
</Files>

I have tried to deny the directory and allow specific files but it denies the directory and does not allow the requested .php files. My code for this is:

<Directory />
    Order deny,allow
    Deny from all
<Directory>

<Files "index.php|post.php">
    Order deny,allow
    Deny from all
</Files>

Please give me some example of blocking access to multiple specific files within a directory.