wp-prohibit-author-comment

For a specific user case I needed a way to prohibit post authors to comment on their own posts. Since the (front)post is cached I had to catch it in the fuctions.php.

'trash' can be replaced with '0' or 'spam'. '0' sets the comment status to "to be moderated", 'spam' goes to the spam folder.

Tested on: WordPress version 4.8