cache.php

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<?php
abstract class Cache
{

    protected static $_drivers = array();
    protected static $_default_driver = 'file';
    protected $_id = null;
    protected $_group = 'default';
    protected $_lifetime = null;

    public abstract function get($id, $group = 'default');

    public abstract function save($value, $lifetime = NULL, $id = FALSE, $group = 'default');

    public abstract function clean($group=false);

    public abstract function remove($id, $group = 'default');

    public function start($lifetime, $id, $group = 'default')
    {
        if ($data = $this->get($id, $group)) {
            echo $data;

            // No es necesario cachear
            return FALSE;
        }
        $this->_lifetime = $lifetime;

        // inicia la captura del buffer
        ob_start();

        // Inicia cacheo
        return TRUE;
    }

    public function end($save = TRUE)
    {
        if (!$save) {
            ob_end_flush();
            return FALSE;
        }

        // obtiene el contenido del buffer
        $value = ob_get_contents();

        // libera el buffer
        ob_end_flush();

        return $this->save($value, $this->_lifetime, $this->_id, $this->_group);
    }

    public static function driver($driver = NULL)
    {
        if (!$driver) {
            $driver = self::$_default_driver;
        }

        if (!isset(self::$_drivers[$driver])) {
            require_once CORE_PATH . "libs/cache/drivers/{$driver}_cache.php";
            $class = $driver . 'cache';
            self::$_drivers[$driver] = new $class();
        }

        return self::$_drivers[$driver];
    }

    public static function setDefault($driver = 'file')
    {
        self::$_default_driver = $driver;
    }

}