Simple Password confirmation with Zend_Form

User.php

<?php

class Application_Form_User extends Zend_Form
{

    public function init()
    {
        /* Form Elements & Other Definitions Here ... */

        $this->setName('user');
        $id = new Zend_Form_Element_Hidden('id');
        $id->addFilter('Int');
        // add all your field here....

        $email = new Zend_Form_Element_Text('email');
        $email->setLabel('Email')
            ->setRequired(true)
            ->addFilter('StripTags')
            ->addFilter('StringTrim')
            ->addValidator('EmailAddress')
            ->addValidator('NotEmpty');

        $password = new Zend_Form_Element_Password('password');
        $password->setLabel('Password')
            ->addFilter('StripTags')
            ->addFilter('StringTrim');

        /* password confirmation - just set the token section to the password field name */
        $confirmPswd = new Zend_Form_Element_Password('confirm_pswd');
        $confirmPswd->setLabel('Confirm Password:');
        $confirmPswd->setAttrib('size', 35);
        $confirmPswd->setRequired(true);
        $confirmPswd->addValidator('Identical', false, array('token' => 'password'));
        $confirmPswd->addErrorMessage('The passwords do not match');

        $submit = new Zend_Form_Element_Submit('submit');
        $submit->setAttrib('id', 'submitbutton');
        $this->addElements(array($id,   
             $email, $password, $confirmPswd,
        $submit));
    }

}