global variable in controller laravel 5.3
<p>How can definition a global variable for use in all function controller</p>

<pre><code>class TestController extends Controller
{
    private $x;

    public function index()
    {
        $this-&gt;$x ='22';
    }            

    public function send_message()
    {
        echo $this-&gt;$x;
    }
}
</code></pre>