title: mysqldump not working at all :(
body: <p>I have this code :</p>
  
  <pre><code>function export() 
  {
      $exp = system("mysqldump -uguku -pjustbe repadmin &gt; back-up.sql");
      if($exp) {echo 'ok';}
      else { echo 'err';}
  }
  </code></pre>
  
  <p>But it doesn't work, all it does, is to create the "back-up.sql" file, but it's blank.
  And I get the "err" message.</p>