title: PHP can't run exec()
body: <p>The basic setup I am trying to accomplish is using pdftk with PHP on IIS</p>
  
  <p>I am trying to setup pdftk to run with PHP for processing on our internal server. I have tested that pdftk does work through command on the server but I cannot get it to run through php. I have tried changing from <code>exec()</code> to <code>passthru()</code>, <code>system()</code>, and <code>shell_exec()</code> just to be sure it wasn't specific.</p>
  
  <p>The main solution I'm finding is saying that the IUSR account needs at least read &amp; execute privileges on <code>cmd.exe</code> in the <code>system32</code> folder. I have tried this and it did not change anything. I always get either "Unable to fork" or "Unable to execute" depending on which command I'm using.</p>