public $data = [];
    public function run()
    {
        echo 'Running ' . $this->getStacked() . ' jobs' . PHP_EOL;
    }
    /**
     * To avoid corrupting the array here
     * we use array_merge here instead of just
     * $this->data[] = $html
     *
     * @param string $data
     */
    public function addData($data)
    {
        $this->data = array_merge($this->data, [$data]);
    }
}
// Stack our jobs on our worker
$worker = new Searcher();
$searches = ['dogs', 'cats', 'birds'];
foreach ($searches as $key => &$search) {
    $search = new SearchGoogle($search);
    $worker->stack($search);
}
// Start all jobs
$worker->start();
// Join all jobs and close worker
$worker->shutdown();
foreach ($worker->data as $html) {
    echo substr($html, 0, 20) . PHP_EOL;
}