title: js web workers and PHP
body: <p>I'm trying to create a <code>cron</code> file in PHP. The application I've created has around 30 active users. I want each user to run a JavaScript web-worker periodically in the background which invokes a PHP file (via ajax/xmlhttprequest) that calls a PHP file to run.</p>
  
  <p>Do JavaScript Web-Workers, when calling a PHP file via the Worker, block the main PHP requests from being executed, since they come from the same browser?</p>