<?php

class Cache
    {

        static function set($id,$var)
            {
                $file = '<?php $cache = '.var_export($var,TRUE).'; ?>';

		$tmpfname = tempnam("/tmp", "cache");

		if(file_put_contents($tmpfname, $file, LOCK_EX) !== FALSE)
		  rename($tmpfname, ONYX.'cache/'.md5($id).'.cache.php') or trigger_error('dossier cache inaccessible en écriture.',E_USER_ERROR);
		else
		  trigger_error('impossible d\'?crire dans '.$tmpfname,E_USER_ERROR);
            }

        static function read($id)
            {
                if(!is_readable(ONYX.'cache/'.md5($id).'.cache.php')) return FALSE;

		$tmpfname = tempnam("/tmp", "cache");
		copy(ONYX.'cache/'.md5($id).'.cache.php', $tmpfname);

                include($tmpfname);

		unlink($tmpfname);

                if(empty($cache)) return FALSE;
                return $cache;
            }

        static function del($id)
            {
                if(!is_file(ONYX.'cache/'.md5($id).'.cache.php')) return FALSE;
                return unlink(ONYX.'cache/'.md5($id).'.cache.php');
            }

        static function flush()
            {
                foreach(glob(ONYX.'cache/*.cache.php') as $file) unlink($file);
            }

    }

?>