Yii2 JS script widget

JS.php

<?php

namespace app\widgets;

use yii\base\Widget;
use yii\web\View;


/**
 * Register JS script.
 *
 * Example:
 *
 *  <?php JS::begin() ?>
 *      <script type="text/javascript">
 *          var SomeJsCode = 'FooBar';
 *      </script>
 *  <?php JS::end() ?>
 */
class JS extends Widget
{
    /** @var int {@see yii\web\View::registerJs()} */
    public $position = View::POS_READY;

    /** @var string {@see yii\web\View::registerJs()} */
    public $key;

    public function init()
    {
        parent::init();
        ob_start();
    }

    public function run()
    {
        $content = ob_get_clean();
        $content = trim($this->stripScriptTag($content));

        $this->getView()->registerJs($content, $this->position, $this->key);
    }

    private function stripScriptTag($content)
    {
        $content = preg_replace('#<script([^>]*)>#is', '', $content);
        $content = preg_replace('#</script>#is', '', $content);
        return $content;
    }
}