$comment_content = wpautop( $comment_content );
$comment_content = str_replace( '<br>', '<br />', $comment_content );
$comment_content = str_replace( '<hr>', '<hr />', $comment_content );
$comment_content = wpautop( $comment_content );
$comment_content = str_replace( '<br>', '<br />', $comment_content );
$comment_content = str_replace( '<hr>', '<hr />', $comment_content );