How to pass URL to custom function

Question

I want to send url the website from Twig template to plugin (I create One plugin) in grav but when I get the value of url is "null". here is code twig

{% extends 'partials/base.html.twig' %}

{% block content %}

    {% set fullUrl = page.url(true)|e %}
        {% set parsedUrl = fullUrl|parse_url %}
        {% set url = parsedUrl.host %} 

    {{ url }}

    {% set data = getdata(url) %}

and for plugin

public function getFunctions(): array
    {
        return [
            new \Twig_SimpleFunction('getdata', [$this, 'exampleFunction'])
        ];
    }

    public function exampleFunction($url)
    {
        // Extract host from URL
        $host = parse_url($url, PHP_URL_HOST);
        if ($host === null) {
            echo 'Invalid URL';
        }
        dump($host);

I am try to get the url in my plugin but I get NULL of value the $url