public function addComment(string $comment) : bool
    {
        if (is_string($comment)) {
            $this->comments[] = $comment;
        }

        return true;
    }
public function addComment(string $comment) : bool
    {
        if (is_string($comment)) {
            $this->comments[] = $comment;
        }

        return true;
    }
public function addComment ( string $ comment ) : bool { if ( is_string ( $ comment ) ) { $ this -> comments [ ] = $ comment ; } return true ; }
Add a comment line to the instance.
@param string $comment
@return bool Returns true always.
Add a comment line to the instance .