PHP - Server side validation method
<p>I am using jQuery Form Validation Plugin to do comprehensive client side validation.</p>

<p>Now I would like to use PHP to do the server side validation.</p>

<p>Check whether the email is email, age is in the right range, etc.</p>

<p>Is there similar package or function collections that I can use rather than write all validation method manually?</p>

<p>Thank you</p>
