Callback.php

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<?php
#require_once 'Zend/Filter/Interface.php';

class Zend_Filter_Callback implements Zend_Filter_Interface
{
    protected $_callback = null;

    protected $_options = null;

    public function __construct($options)
    {
        if ($options instanceof Zend_Config) {
            $options = $options->toArray();
        } else if (!is_array($options) || !array_key_exists('callback', $options)) {
            $options          = func_get_args();
            $temp['callback'] = array_shift($options);
            if (!empty($options)) {
                $temp['options'] = array_shift($options);
            }

            $options = $temp;
        }

        if (!array_key_exists('callback', $options)) {
            #require_once 'Zend/Filter/Exception.php';
            throw new Zend_Filter_Exception('Missing callback to use');
        }

        $this->setCallback($options['callback']);
        if (array_key_exists('options', $options)) {
            $this->setOptions($options['options']);
        }
    }

    public function getCallback()
    {
        return $this->_callback;
    }

    public function setCallback($callback, $options = null)
    {
        if (!is_callable($callback)) {
            #require_once 'Zend/Filter/Exception.php';
            throw new Zend_Filter_Exception('Callback can not be accessed');
        }

        $this->_callback = $callback;
        $this->setOptions($options);
        return $this;
    }

    public function getOptions()
    {
        return $this->_options;
    }

    public function setOptions($options)
    {
        $this->_options = $options;
        return $this;
    }

    public function filter($value)
    {
        $options = array();

        if ($this->_options !== null) {
            if (!is_array($this->_options)) {
                $options = array($this->_options);
            } else {
                $options = $this->_options;
            }
        }

        array_unshift($options, $value);

        return call_user_func_array($this->_callback, $options);
    }
}