Image Resize

how to resize the picture ?

350x200 

PHP Code:

   public function insert_news()
    {

    $config['upload_path']       = 'uploads/news/';
        $config['allowed_types']     = 'gif|jpg|png';
        $config['encrypt_name']      = TRUE;

        $this->load->library('upload', $config);

        if ($this->upload->do_upload('news_image'))
        {
             
        $image         = $this->upload->data();
        $image_url     = $image['file_name'];
        $db_insert     ='upload/news/'.$image_url.'';


        $data=array(
              'news_title'     => $this->input->post('news_title'),
              'news_content'    => $this->input->post('news_content'),
              'news_image'    =>    $db_insert,
                 'news_sef'=>sef($this->input->post('news_title'))
        );

        $this->load->model('vt');
        $result = $this->vt->insert_news($data);
        if ($result) {
            echo "yes";
        }else

        {
            echo "no";
        }

        }   
    }