/home/joan/000www/repo/spirit/1.0/core/extensions/cache/drivers/file_cache.php

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<?php
class FileCache implements CacheInterface
{
    protected static function _get_filename($id, $group)
    {
        return 'cache_'.md5($id).'.'.md5($group);
    }
        public static function get($id, $group) 
    {
        $filename = APP_PATH . 'temp/cache/'.self::_get_filename($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 $data;
                }
        return null;
    }
        public static function save($id, $group, $value, $lifetime)
    {
        if($lifetime == null)
            $lifetime = 'undefined';
        return file_put_contents(APP_PATH . 'temp/cache/'.self::_get_filename($id, $group), "$lifetime\n$value");
    }
        public static function clean($group=false)
    {
        $pattern = $group ? APP_PATH . 'temp/cache/'.'*.'.md5($group) : APP_PATH . 'temp/cache/'.'*';
        foreach (glob($pattern) as $filename) {
            if(!unlink($filename)) {
                return false;
            }
        }
    }
        public static function remove($id, $group)
    {
        return unlink(APP_PATH . 'temp/cache/'.self::_get_filename($id, $group));
    }
}

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