Call to undefined function filter_var()
<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>
