scraping-otro-hilo.php

<?php

class Task extends Threaded
{
    public $response;

    public function scraping()
    {
        $content = file_get_contents('https://www.amazon.com');
        preg_match('~<title>(.+)</title>~', $content, $matches);
        $this->response = $matches[1];
    }
}

$task = new Task;

$thread = new class($task) extends Thread {
    private $task;

    public function __construct(Threaded $task)
    {
        $this->task = $task;
    }

    public function run()
    {
        $this->task->scraping();
    }
};

$thread->start() && $thread->join();

var_dump($task->response);