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<?php
/**
 * Rule checking the value via a callback function (method)
 *
 * PHP version 5
 *
 * LICENSE:
 *
 * Copyright (c) 2006-2011, Alexey Borzov <avb@php.net>,
 *                          Bertrand Mansion <golgote@mamasam.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *    * Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *    * Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *    * The names of the authors may not be used to endorse or promote products
 *      derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * @category   HTML
 * @package    HTML_QuickForm2
 * @author     Alexey Borzov <avb@php.net>
 * @author     Bertrand Mansion <golgote@mamasam.com>
 * @license    http://opensource.org/licenses/bsd-license.php New BSD License
 * @version    SVN: $Id: Callback.php 311435 2011-05-26 10:30:06Z avb $
 * @link       http://pear.php.net/package/HTML_QuickForm2
 */

/**
 * Base class for HTML_QuickForm2 rules
 */
require_once 'HTML/QuickForm2/Rule.php';

/**
 * Rule checking the value via a callback function (method)
 *
 * The Rule needs a valid callback as a configuration parameter for its work, it
 * may also be given additional arguments to pass to the callback alongside the
 * element's value. See {@link mergeConfig()} for description of possible ways
 * to pass configuration parameters.
 *
 * The callback will be called with element's value as the first argument, if
 * additional arguments were provided they'll be passed as well. It is expected
 * to return false if the value is invalid and true if it is valid.
 *
 * Checking that the value is not empty:
 * <code>
 * $str->addRule('callback', 'The field should not be empty', 'strlen');
 * </code>
 * Checking that the value is in the given array:
 * <code>
 * $meta->addRule('callback', 'Unknown variable name',
 *                array('callback' => 'in_array',
 *                      'arguments' => array(array('foo', 'bar', 'baz'))));
 * </code>
 * The same, but with rule registering first:
 * <code>
 * HTML_QuickForm2_Factory::registerRule(
 *     'in_array', 'HTML_QuickForm2_Rule_Callback',
 *     'HTML/QuickForm2/Rule/Callback.php', 'in_array'
 * );
 * $meta->addRule('in_array', 'Unknown variable name', array(array('foo', 'bar', 'baz')));
 * </code>
 *
 * @category   HTML
 * @package    HTML_QuickForm2
 * @author     Alexey Borzov <avb@php.net>
 * @author     Bertrand Mansion <golgote@mamasam.com>
 * @version    Release: @package_version@
 */
class HTML_QuickForm2_Rule_Callback extends HTML_QuickForm2_Rule
{
   /**
    * Validates the owner element
    *
    * @return   bool    the value returned by a callback function
    */
    protected function validateOwner()
    {
        $value  = $this->owner->getValue();
        $config = $this->getConfig();
        return (bool)call_user_func_array(
            $config['callback'], array_merge(array($value), $config['arguments'])
        );
    }

protected function getJavascriptCallback()
    {
        HTML_QuickForm2_Loader::loadClass('HTML_QuickForm2_JavascriptBuilder');

$config    = $this->getConfig();
        $arguments = array($this->owner->getJavascriptValue());
        foreach ($config['arguments'] as $arg) {
            $arguments[] = HTML_QuickForm2_JavascriptBuilder::encode($arg);
        }
        return "function() { return " . $this->findJavascriptName() .
               "(" . implode(', ', $arguments) . "); }";
    }

/**
    * Finds a name for Javascript callback function
    *
    * The method first checks whether javascript callback 'js_callback' was
    * provided to the Rule and returns that if found.
    *
    * If an explicit 'js_callback' was not provided, it tries to generate a name
    * equal (for a given value of "equal") to PHP callback name. This may be useful
    * if e.g. using HTML_AJAX package to generate class stubs in JS and in similar
    * circumstances.
    *
    * If a callback does not have a name (it is a lambda function or a closure)
    * then an exception will be raised.
    *
    * @return string
    */
    protected function findJavascriptName()
    {
        $config = $this->getConfig();

// oh joy! we have an explicitly given JS callback!
        if (isset($config['js_callback'])) {
            return $config['js_callback'];
        }
        // no luck, try to come up with a name similar to PHP one
        // function name, filter lambdas created via create_function...
        if (is_string($config['callback']) && chr(0) != $config['callback'][0]) {
            return str_replace('::', '.', $config['callback']);
        // object instance method
        } elseif (is_array($config['callback']) && is_object($config['callback'][0])) {
            return '(new ' . get_class($config['callback'][0]) . ').' . $config['callback'][1];
        // static class method
        } elseif (is_array($config['callback']) && is_string($config['callback'][0])) {
            return $config['callback'][0] . '.' . $config['callback'][1];
        // lambda, closure, whatever: no sane way to translate
        } else {
            throw new HTML_QuickForm2_InvalidArgumentException(
                "Cannot generate Javascript callback name, please provide one"
            );
        }
    }

/**
    * Tests whether a given value is an array containing at least one of the given keys
    *
    * @param    mixed   if not an array, method will return false
    * @param    array   keys to test for
    * @return   bool
    */
    protected static function arrayHasSomeKeys($search, array $keys)
    {
        if (is_array($search)) {
            foreach ($keys as $key) {
                if (array_key_exists($key, $search)) {
                    return true;
                }
            }
        }
        return false;
    }

/**
    * Merges local configuration with that provided for registerRule()
    *
    * "Global" configuration may be passed to
    * {@link HTML_QuickForm2_Factory::registerRule()} in either of the
    * following formats
    *  - callback
    *  - array(['callback' => callback][, 'arguments' => array(...)][, 'js_callback' => string])
    *
    * "Local" configuration may be passed to the constructor in either of
    * the following formats
    *  - callback or arguments (interpretation depends on whether the global
    *    configuration already contains the callback)
    *  - array(['callback' => callback][, 'arguments' => array(...)][, 'js_callback' => string])
    *
    * As usual, global config overrides local one. It is a good idea to use the
    * associative array format to prevent ambiguity.
    *
    * @param    mixed   Local configuration
    * @param    mixed   Global configuration
    * @return   mixed   Merged configuration
    */
    public static function mergeConfig($localConfig, $globalConfig)
    {
        if (!isset($globalConfig)) {
            $config = $localConfig;

} else {
            if (!self::arrayHasSomeKeys($globalConfig, array('callback', 'arguments', 'js_callback'))) {
                $config = array('callback' => $globalConfig);
            } else {
                $config = $globalConfig;
            }
            if (self::arrayHasSomeKeys($localConfig, array('callback', 'arguments', 'js_callback'))) {
                $config += $localConfig;
            } elseif(isset($localConfig)) {
                $config += array('callback' => $localConfig, 'arguments' => $localConfig);
            }
        }
        return $config;
    }

/**
    * Sets the callback to use for validation and its additional arguments
    *
    * @param    callback|array  Callback or array ('callback' => validation callback
    *                                              [, 'arguments' => additional arguments]
    *                                              [, 'js_callback' => javascript callback
    *                                                               for client-side validation])
    * @return   HTML_QuickForm2_Rule
    * @throws   HTML_QuickForm2_InvalidArgumentException if callback is missing or invalid
    *               or additional arguments is not an array
    */
    public function setConfig($config)
    {
        if (!is_array($config) || !isset($config['callback'])) {
            $config = array('callback' => $config);
        }
        if (!is_callable($config['callback'], false, $callbackName)) {
            throw new HTML_QuickForm2_InvalidArgumentException(
                'Callback Rule requires a valid callback, \'' . $callbackName .
                '\' was given'
            );
        }
        if (array_key_exists('arguments', $config) && !is_array($config['arguments'])) {
            throw new HTML_QuickForm2_InvalidArgumentException(
                'Callback Rule expects additional callback arguments to be an array, ' .
                preg_replace('/\s+/', ' ', var_export($config['arguments'], true)) . ' given'
            );
        }
        return parent::setConfig($config + array('arguments' => array()));
    }
}
?>

Editing: Callback.php

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