file_cache.php

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<?php
class FileCache extends Cache
{

    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, $group);
        if (file_exists($filename)) {
            $fh = fopen($filename, 'r');

            $lifetime = trim(fgets($fh));
            if ($lifetime == 'undefined' || $lifetime >= time()) {
                $data = stream_get_contents($fh);
            } else {
                $data = null;
            }

            fclose($fh);
            return $data;
        }
        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 = 'undefined';
        }

        return file_put_contents(APP_PATH . 'temp/cache/' . $this->_getFilename($id, $group), "$lifetime\n$value");
    }

    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));
    }

}