title: php exec() syntax check
body: <p>This works in the command prompt(in one line) : </p>
  
  <pre><code>cd C:\Program Files (x86)\LibreOffice 4\program &amp;&amp; 
  "C:\Program Files (x86)\LibreOffice 4\program\python.exe" unoconv -f pdf d:\class1.doc
  </code></pre>
  
  <p>but when it comes to do the same in PHP's exec() nothing happens - neither message nor any file, probably due to a syntax error : </p>
  
  <pre><code>echo exec('cd C:\\Program Files (x86)\\LibreOffice 4\\program &amp;&amp;
  "C:\\Program Files (x86)\\LibreOffice 4\\program\\python.exe" unoconv -f pdf d:\\class1.doc');
  </code></pre>