BBPress / REDIRECT REPLY POSTS TO TOPIC WITH REPLY ANCHOR

bp-custom.php

<?php
// ---------------------------------------- REDIRECT REPLY POSTS TO TOPIC WITH REPLY ANCHOR
function jrevillini_reply_redirect( $wp_query ) {
  if ( !function_exists('bbp_get_reply_url') ) return; // skip this if bbpress not active
  if ( !isset($wp_query->query['reply']) ) return; // skip if not a bbpress reply page
  if ( isset($wp_query->query['edit']) ) return; //skip if we are EDITING a bbpress reply
  wp_safe_redirect( bbp_get_reply_url( $wp_query->query['reply'] ) );  
}
add_action('pre_get_posts', 'jrevillini_reply_redirect');

Where this code must to input?
Can you help me

You can put it in functions.php but it may be easier for you to use the code snippets plugin like this: http://tinyurl.com/y49p67as

but i've already add that code to functions.php, and then my website down can't to be access.

i don't know why it's happened

If you give me the error generated in your error_log file I'm sure we can troubleshoot this. I'm pretty sure the code works as others have implemented it with success.

Hi James - thanks for this code! I've added it to Code Snippets but it seems to generate a redirect loop when a reply URL is clicked, e.g. https://300hours.com/reply/new-here-dont-be-shy-say-hello-here-and-earn-your-first-badge-4/

Any idea on how to solve?