[Wiki] How to run any third-party PHP software in a view

namespace ho96\phpfreechat;
 
use Yii;
use yii\web\View;
use yii\base\Widget;
 
class PHPFreeChat extends Widget
{
    private $_assetsUrl;
 
    public function run()
    {
        if($this->_assetsUrl === null)
        {
            $assets = dirname(__FILE__) . DIRECTORY_SEPARATOR . 'assets';
            $this -> _assetsUrl = Yii::$app->getAssetManager()->publish($assets, array('beforeCopy' => 
                function($from, $to)
                {
                if(strpos($from, '.directory') < 1)
                  return $from;
                }
             ));
        }
 
        $this->getView()->registerJs("
            resizeIframe();
 
            $(window).resize(function(){
                resizeIframe();
            });
 
            function resizeIframe()
            {
                $('iframe').attr('width',$('#iframe-div').width());
                $('iframe').attr('height','770');           
            }
              ", View::POS_END, 'iframe');
 
        echo '<div id="iframe-div">';
        echo    '<iframe src="' . $this->_assetsUrl[1] . '/phpfreechat"></iframe>';
        echo '</div>';
    }
}