PHP webscraper does not produce errors nor start the loop/create output

Question

I am writing a web scraper in PHP using gitpod. After a while I have managed to solve all problems. But even though no problems are left, the code does not open the browser nor produce any output. Does anybody have an idea why that could be the case?

<?php
if (file_exists('vendor/autoload.php')) {
    require 'vendor/autoload.php';
}
use Goutte\Client;
$client = new Goutte\Client();

// Create a new array to store the scraped data
$data = array();

// Loop through the pages
if ($client->getResponse()->getStatus() != 200) {
    echo 'Failed to access website. Exiting script.';
    exit();
}

for ($i = 0; $i < 3; $i++) {
    // Make a request to the website
    $crawler = $client->request('GET', 'https://ec.europa.eu/info/law/better-regulation/have-your-say/initiatives_de?page=' . $i);

    // Find all the initiatives on the page
    $crawler->filter('.initiative')->each(function ($node) use (&$data) {
        // Extract the information for each initiative
        $title = $node->filter('h3')->text();
        $link = $node->filter('a')->attr('href');
        $description = $node->filter('p')->text();
        $deadline = $node->filter('time')->attr('datetime');

        // Append the data for the initiative to the data array
        $data[] = array($title, $link, $description, $deadline);
    });
    // Sleep for a random amount of time between 5 and 10 seconds
    $sleep = rand(5,10);
    sleep($sleep);
}

// Open the output file
$fp = fopen('initiatives.csv', 'w');

// Write the header row
fputcsv($fp, array('Title', 'Link', 'Description', 'Deadline'));

// Write the data rows
foreach ($data as $row) {
    fputcsv($fp, $row);
}

// Close the output file
fclose($fp);
?>