nixfile_cache.php

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<?php
class NixfileCache extends Cache
{
    const MAX_TIMESTAMP = 2147401800;

    protected function _getFilename($id, $group)
    {
        return 'cache_' . md5($id) . '.' . md5($group);
    }

    public function get($id, $group = 'default')
    {
        $this->_id = $id;
        $this->_group = $group;

        $filename = APP_PATH . 'temp/cache/' . $this->_getFilename($id, $group);

        if (is_file($filename) && filemtime($filename) >= time()) {
            return file_get_contents($filename);
        }

        return null;
    }

    public function save($value, $lifetime = NULL, $id = FALSE, $group = 'default')
    {
        if (!$id) {
            $id = $this->_id;
            $group = $this->_group;
        }

        if ($lifetime) {
            $lifetime = strtotime($lifetime);
        } else {
            $lifetime = self::MAX_TIMESTAMP;
        }

        $filename = APP_PATH . 'temp/cache/' . $this->_getFilename($id, $group);

        // Almacena en la fecha de modificacion la fecha de expiracion
        return file_put_contents($filename, $value) && touch($filename, $lifetime);
    }

    public function clean($group = FALSE)
    {
        $pattern = $group ? APP_PATH . 'temp/cache/' . '*.' . md5($group) : APP_PATH . 'temp/cache/*';
        foreach (glob($pattern) as $filename) {
            if (!unlink($filename)) {
                return false;
            }
        }
        return true;
    }

    public function remove($id, $group = 'default')
    {
        return unlink(APP_PATH . 'temp/cache/' . $this->_getFilename($id, $group));
    }

}