title: PHP Exec command works intermittently
body: <p>I have been running the following command line and has been working fine.  Then without warning it has stopped and failes to execute.  </p>
  
  <pre><code>exec("$path_to_php $emailer $digest_sub_security_var \"$vid_menu\" \"$image_menu\" \"$article_menu\" $media_query_lmt_v $media_query_lmt_i $media_query_lmt_a &gt; /dev/null &amp;");
  </code></pre>
  
  <p>I think (but can not be sure) that it's something to do with the following <code>\"$vid_menu\" \"$image_menu\" \"$article_menu\"</code></p>
  
  <p>These items are image thumnails, titles, descptions in text and urls</p>
  
  <p>How can I get the command line to work consistently.</p>