title: PHP Parallel extension causing This site can’t be reached, when executing \parallel\run()
body: <p>I have Xampp with PHP7.4.18 installed, and trying to execute curl in separate thread, to prevent blocking website runtime.
  Installed  regarding those instructions:
  <a href="https://stackoverflow.com/a/70193902/2599826">https://stackoverflow.com/a/70193902/2599826</a></p>
  <pre><code>php -v
  
  PHP 7.4.18 (cli) (built: Apr 27 2021 17:17:20) ( ZTS Visual C++ 2017 x64 )
  Copyright (c) The PHP Group
  Zend Engine v3.4.0, Copyright (c) Zend Technologies
  </code></pre>
  <p>used <a href="https://windows.php.net/downloads/pecl/releases/parallel/1.1.4/php_parallel-1.1.4-7.4-ts-vc15-x64.zip" rel="nofollow noreferrer">this</a> file
  php_parallel-1.1.4-7.4-ts-vc15-x64.zip</p>
  <p>in &lt;? phpinfo() i see:</p>
  <pre><code>parallel
  parallel support    enabled
  parallel version    1.1.4
  </code></pre>
  <p><strong>This is my code</strong></p>
  <pre><code>&lt;?php
  $runtime = new \parallel\Runtime();
  
  $future = $runtime-&gt;run(function(){
      for ($i = 0; $i &lt; 50; $i++)
          echo &quot;$i&quot;;
          
      return &quot;easy&quot;;
  });
  
  for ($i = 0; $i &lt; 50; $i++) {
      echo &quot;.&quot;;
  }
  </code></pre>
  <p>When I refresh page, in browser i'm getting</p>
  <pre><code>This site can’t be reached
  The connection was reset.
  </code></pre>
  <p>php/apache error logs are empty</p>