title: Symfony calls the PHP garbage collector on Ubuntu 14.04 even when session.gc_probability is set to 0
body: <p>As the title state for some reason my Symfony 2.5 Application is calling the php garbage collector even when all of my php.ini files have:</p>
  
  <pre><code>session.gc_probability = 0
  </code></pre>
  
  <p>Does anyone know how to prevent this from happening?</p>
  
  <p>Error message im getting:</p>
  
  <pre><code>Notice: SessionHandler::gc(): ps_files_cleanup_dir: opendir(/var/lib/php5)
  failed: Permission denied (13) in /&lt;path-to-my-site&gt;/var/cache/dev/classes.php line 432 
  </code></pre>
  
  <p>FROM PHPINFO():</p>
  
  <pre><code>Directive               Local Value   Master Value
  session.gc_divisor      1000          1000
  session.gc_maxlifetime  86400         86400
  session.gc_probability  0             0
  </code></pre>
  
  <p>I know that i can just give the www-data user permission to the <code>/var/lib/php5</code> folder or change the <code>session.save_path</code> to somewhere that the <code>www-data</code> user has access to already but i want to know why this process is even getting called when it should be disabled.</p>