WordPress: Disable IP collection through WordPress comments

functions.php

<?php

/**
 * Remove IP collection in WordPress comments
 * Source: http://www.wpbeginner.com/wp-tutorials/how-to-stop-storing-ip-address-in-wordpress-comments/
 */
function wpb_remove_commentsip( $comment_author_ip ) {
return '';
}
add_filter( 'pre_comment_user_ip', 'wpb_remove_commentsip' );