title: execute windows commands in command prompt using php
body: <p>Hello friends i am getting output of this command 
  This code works perfectly </p>
  
  <pre><code>&lt;?php
    echo exec('whoami');
  ?&gt;
  </code></pre>
  
  <p>but problem in </p>
  
  <pre><code>&lt;?php
    echo exec('C:\\Users\\user\\Desktop\\abc\\xpdfbin-win-3.04\\bin64&gt;pdfinfo -f 1 test.pdf');
  ?&gt;
  </code></pre>
  
  <p>can you please give me your expert advice?</p>