Zend FR

        $cache = Zend_Registry::get('cache');
        
    // Get List Root Category in cache.
    $root_categorys = $cache->load('sitemap_list_root_categorys');
    $cache_act = 1;
        
    // If is not in cache.
    if(!$root_categorys) {
            
        $table_category = new Table_Catalog_Category_Entity();
            $root_categorys = $table_category->fetchAll('is_active = 1 AND parent_id = 0');
            
            // On met le résultat en cache.
        $cache->save($root_categorys, 'sitemap_list_root_categorys');
        $cache_act = 0;
    }

        // Load configuration file.
        $config = new Zend_Config($this->getOptions());
        
        if (extension_loaded('APC')) {
            $backendName = 'APC';
        } else {
            $backendName = 'File';
        }
            
        $frontendName = 'Core';
            
        $frontendOptions = array(
            'automatic_serialization' => $config->cache->core->automatic_serialization, 
            'lifetime' => $config->cache->core->lifetime
        );
        
        $backendOptions = array(
            'cache_dir' => $config->cache->core->directory, 
        );
        
        // Start the cache.
        $this->_cache = Zend_Cache::factory(
            $frontendName,
            $backendName,
            $frontendOptions,
            $backendOptions
        );
            
        Zend_Db_Table_Abstract::setDefaultMetadataCache($this->_cache);
            
        Zend_Registry::set('cache', $this->_cache); 

        return $this->_cache;

        <cache>
            <core>
                <front>Core</front>
                <method>File</method>
                <lifetime>86400</lifetime>
                <automatic_serialization>true</automatic_serialization>
                <directory><zf:const zf:name="ROOT_PATH"/>/tmp/cache</directory>
            </core>
        </cache>