title: Call to undefined function filter_var()
body: <p>After transfering my site to another hosting i got this error:</p>
  
  <pre><code>    Fatal error: Call to undefined function filter_var() in
   /home/ultrastep/ultrastep.ru/docs/sites/all/modules/q_cart/q_cart.module on line 410
  </code></pre>
  
  <p>PHP version on server is 5.2.10.</p>
  
  <p>Any ideas whats wrong?</p>