PHP Pthread start（）方法不适用于Slim框架

Question

namespace Service\Component\ThreadWebRequest;
use Thread;
class ThreadWebRequest extends Thread {

    public $url;
    public $headers;
    public $data;

    function __construct($url, $headers) {
      $this->url  = $url;
      $this->headers = $headers;
      //$this->start();
    }

    public function run() {
      $timeout = 0; // set to zero for no timeout
      $ch = curl_init();

      curl_setopt ($ch, CURLOPT_URL, $this->url);
      curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/4.0"); //Optional
      curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE); // Avoid SSL certificate issue
      curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
      curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
      curl_setopt($ch, CURLOPT_HTTPHEADER, $this->headers);
      $file_contents = curl_exec($ch);

      if(curl_errno($ch))
      {
          return 'Curl error: ' . curl_error($ch);
      }
      curl_close($ch);

      $this->data = $file_contents;
    }

}

在我的控制器中我有这个，

 $threadRequest = new ThreadWebRequest($value['uri'], $headers);
 $threadRequest->start() && $threadRequest->join();
 $batchResponse = $threadRequest->data;

我收到此错误。 PHP致命错误：在第300行的/opt/services-api/v2/vendor/composer/ClassLoader.php中的非对象上调用成员函数findFile（）

如果我在苗条之外访问线程，它工作正常。不确定在slim框架路由器中启动线程需要做什么。