Depending on how your theme is set up, comments_open
might be the filter you want. (in functions.php)
add_filter( 'comments_open', 'block_comments_for_others', 10, 2 );
function block_comments_for_others( $is_open, $post_id ) {
$is_open = false;
$post_author_id = get_post_field( 'post_author', $post_id );
if ( get_current_user_id() == $post_author_id || current_user_can('administrator') )
$is_open = true;
return $is_open;
}
Or possibly something like this right in your theme where you display comments:
if ( get_current_user_id() == get_the_author_meta( 'ID' ) || current_user_can('administrator') ) {
comments_template();
} else {
echo "No commenting for you";
}
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