Filter.php

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

class Zend_Filter implements Zend_Filter_Interface
{

    const CHAIN_APPEND  = 'append';
    const CHAIN_PREPEND = 'prepend';

    protected $_filters = array();

    protected static $_defaultNamespaces = array();

    public function addFilter(Zend_Filter_Interface $filter, $placement = self::CHAIN_APPEND)
    {
        if ($placement == self::CHAIN_PREPEND) {
            array_unshift($this->_filters, $filter);
        } else {
            $this->_filters[] = $filter;
        }
        return $this;
    }

    public function appendFilter(Zend_Filter_Interface $filter)
    {
        return $this->addFilter($filter, self::CHAIN_APPEND);
    }

    public function prependFilter(Zend_Filter_Interface $filter)
    {
        return $this->addFilter($filter, self::CHAIN_PREPEND);
    }

    public function getFilters()
    {
        return $this->_filters;
    }

    public function filter($value)
    {
        $valueFiltered = $value;
        foreach ($this->_filters as $filter) {
            $valueFiltered = $filter->filter($valueFiltered);
        }
        return $valueFiltered;
    }

    public static function getDefaultNamespaces()
    {
        return self::$_defaultNamespaces;
    }

    public static function setDefaultNamespaces($namespace)
    {
        if (!is_array($namespace)) {
            $namespace = array((string) $namespace);
        }

        self::$_defaultNamespaces = $namespace;
    }

    public static function addDefaultNamespaces($namespace)
    {
        if (!is_array($namespace)) {
            $namespace = array((string) $namespace);
        }

        self::$_defaultNamespaces = array_unique(array_merge(self::$_defaultNamespaces, $namespace));
    }

    public static function hasDefaultNamespaces()
    {
        return (!empty(self::$_defaultNamespaces));
    }

    public static function get($value, $classBaseName, array $args = array(), $namespaces = array())
    {
        trigger_error(
            'Zend_Filter::get() is deprecated as of 1.9.0; please update your code to utilize Zend_Filter::filterStatic()',
            E_USER_NOTICE
        );

        return self::filterStatic($value, $classBaseName, $args, $namespaces);
    }

    public static function filterStatic($value, $classBaseName, array $args = array(), $namespaces = array())
    {
        #require_once 'Zend/Loader.php';
        $namespaces = array_merge((array) $namespaces, self::$_defaultNamespaces, array('Zend_Filter'));
        foreach ($namespaces as $namespace) {
            $className = $namespace . '_' . ucfirst($classBaseName);
            if (!class_exists($className, false)) {
                try {
                    $file = str_replace('_', DIRECTORY_SEPARATOR, $className) . '.php';
                    if (Zend_Loader::isReadable($file)) {
                        Zend_Loader::loadClass($className);
                    } else {
                        continue;
                    }
                } catch (Zend_Exception $ze) {
                    continue;
                }
            }

            $class = new ReflectionClass($className);
            if ($class->implementsInterface('Zend_Filter_Interface')) {
                if ($class->hasMethod('__construct')) {
                    $object = $class->newInstanceArgs($args);
                } else {
                    $object = $class->newInstance();
                }
                return $object->filter($value);
            }
        }
        #require_once 'Zend/Filter/Exception.php';
        throw new Zend_Filter_Exception("Filter class not found from basename '$classBaseName'");
    }
}