Xcache.php

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<?php
#require_once 'Zend/Cache/Backend/Interface.php';

#require_once 'Zend/Cache/Backend.php';


class Zend_Cache_Backend_Xcache extends Zend_Cache_Backend implements Zend_Cache_Backend_Interface
{

    const TAGS_UNSUPPORTED_BY_CLEAN_OF_XCACHE_BACKEND = 'Zend_Cache_Backend_Xcache::clean() : tags are unsupported by the Xcache backend';
    const TAGS_UNSUPPORTED_BY_SAVE_OF_XCACHE_BACKEND =  'Zend_Cache_Backend_Xcache::save() : tags are unsupported by the Xcache backend';

    protected $_options = array(
        'user' => null,
        'password' => null
    );

    public function __construct(array $options = array())
    {
        if (!extension_loaded('xcache')) {
            Zend_Cache::throwException('The xcache extension must be loaded for using this backend !');
        }
        parent::__construct($options);
    }

    public function load($id, $doNotTestCacheValidity = false)
    {
        if ($doNotTestCacheValidity) {
            $this->_log("Zend_Cache_Backend_Xcache::load() : \$doNotTestCacheValidity=true is unsupported by the Xcache backend");
        }
        $tmp = xcache_get($id);
        if (is_array($tmp)) {
            return $tmp[0];
        }
        return false;
    }

    public function test($id)
    {
        if (xcache_isset($id)) {
            $tmp = xcache_get($id);
            if (is_array($tmp)) {
                return $tmp[1];
            }
        }
        return false;
    }

    public function save($data, $id, $tags = array(), $specificLifetime = false)
    {
        $lifetime = $this->getLifetime($specificLifetime);
        $result = xcache_set($id, array($data, time()), $lifetime);
        if (count($tags) > 0) {
            $this->_log(self::TAGS_UNSUPPORTED_BY_SAVE_OF_XCACHE_BACKEND);
        }
        return $result;
    }

    public function remove($id)
    {
        return xcache_unset($id);
    }

    public function clean($mode = Zend_Cache::CLEANING_MODE_ALL, $tags = array())
    {
        switch ($mode) {
            case Zend_Cache::CLEANING_MODE_ALL:
                // Necessary because xcache_clear_cache() need basic authentification
                $backup = array();
                if (isset($_SERVER['PHP_AUTH_USER'])) {
                    $backup['PHP_AUTH_USER'] = $_SERVER['PHP_AUTH_USER'];
                }
                if (isset($_SERVER['PHP_AUTH_PW'])) {
                    $backup['PHP_AUTH_PW'] = $_SERVER['PHP_AUTH_PW'];
                }
                if ($this->_options['user']) {
                    $_SERVER['PHP_AUTH_USER'] = $this->_options['user'];
                }
                if ($this->_options['password']) {
                    $_SERVER['PHP_AUTH_PW'] = $this->_options['password'];
                }

                $cnt = xcache_count(XC_TYPE_VAR);
                for ($i=0; $i < $cnt; $i++) {
                    xcache_clear_cache(XC_TYPE_VAR, $i);
                }

                if (isset($backup['PHP_AUTH_USER'])) {
                    $_SERVER['PHP_AUTH_USER'] = $backup['PHP_AUTH_USER'];
                    $_SERVER['PHP_AUTH_PW'] = $backup['PHP_AUTH_PW'];
                }
                return true;
                break;
            case Zend_Cache::CLEANING_MODE_OLD:
                $this->_log("Zend_Cache_Backend_Xcache::clean() : CLEANING_MODE_OLD is unsupported by the Xcache backend");
                break;
            case Zend_Cache::CLEANING_MODE_MATCHING_TAG:
            case Zend_Cache::CLEANING_MODE_NOT_MATCHING_TAG:
            case Zend_Cache::CLEANING_MODE_MATCHING_ANY_TAG:
                $this->_log(self::TAGS_UNSUPPORTED_BY_CLEAN_OF_XCACHE_BACKEND);
                break;
            default:
                Zend_Cache::throwException('Invalid mode for clean() method');
                break;
        }
    }

    public function isAutomaticCleaningAvailable()
    {
        return false;
    }

}