Chain.php

<?php
class ZendDbSchema_Validate_Db_Schema_Chain
    implements Zend_Validate_Interface
{
    protected $_validators = array();

    protected $_messages = array();

    protected $_errors = array();

    public function addValidator(Zend_Validate_Interface $validator, $breakChainOnFailure = false)
    {
        $this->_validators[] = array(
            'instance' => $validator,
            'breakChainOnFailure' => (boolean) $breakChainOnFailure
        );
        return $this;
    }

    public function isValid($value)
    {
        $this->_messages = array();
        $this->_errors   = array();
        $result = true;

        foreach ($this->_validators as $element) {
            $validator = $element['instance'];
            if ($validator->isValid($value)) {
                continue;
            }
            $result = false;
            $messages = $validator->getMessages();
            $this->_messages = array_merge($this->_messages, $messages);
            $this->_errors   = array_merge($this->_errors,   array_keys($messages));
            if ($element['breakChainOnFailure']) {
                break;
            }
        }
        return $result;
    }

    public function getMessages()
    {
        return $this->_messages;
    }

    public function getErrors()
    {
        return $this->_errors;
    }
}