how to disable link in comments?

how to disable link in comments?
this code in function.php of my site not working

function author_link(){
global $comment;
$comment_ID = $comment->user_id;
$author = get_comment_author( $comment_ID );
$url = get_comment_author_url( $comment_ID );
if ( empty( $url ) || 'http://' == $url )
$return = $author;
else
$return = "$author";
return $return;
}
add_filter('get_comment_author_link', 'author_link');

and this code in comments.php not working

add_filter('comment_form_default_fields', 'mw_unset_url_field');
function mw_unset_url_field($fields){
if(isset($fields['url']))
unset($fields['url']);
return $fields;

i clear cache and test again but not working this codes
please help me to disable link in comments Without plugin

• This topic was modified 6 years, 1 month ago by tete911.
• This topic was modified 6 years, 1 month ago by tete911.