title: php exec() background process issues
body: <p>I'm trying to process a file in the background with the following command, but it does nothing.</p>
  
  <pre><code>exec("php csv.php $file $user &gt; /dev/null &amp;", $output);
  </code></pre>
  
  <p>If I remove <code>&gt; /dev/null &amp;</code> then the file processes, but not in the background.</p>
  
  <pre><code>exec("php csv.php $file $user", $output);
  </code></pre>
  
  <p>Any ideas?</p>