Zend_Form_Decorator_JsValidation - adding custom validator (PHP side)

Custom validator (PHP part)

<?php
class My_Form_Decorator_JsValidation extends Zend_Form_Decorator_JsValidation
{
	const ORDER_MY_CUSTOM = 100;

    protected function handleCustomValidators($name, $msgs, $validator)
    {
    	switch($name) {
    		case 'MyCustomValidator':
    			return array(
	    				self::ORDER_MY_CUSTOM,
	    				array(
	    					'param' => $validator->getParam()
	    				),
	    				array(
	    					'notValid' => $msgs[MyCustomValidator::NOT_VALID]
	    				)
    				);
    		default:
    			return parent::handleCustomValidators($name, $msgs, $validator);
    	}

    	return null;
    }
}