php-memory-ram-shared-caching

	// ########## Caching ########## //
	/*
	public function save_cach($data, $name, $timeout) {
		return $this->save_cache($data, $name, $timeout);
	}
	public function save_cache($data, $name, $timeout) {
		// delete cache
		$id=shmop_open($this->get_cache_id($name), "a", 0, 0);
		shmop_delete($id);
		shmop_close($id);

		// get id for name of cache
		$id=shmop_open($this->get_cache_id($name), "c", 0644, strlen(serialize($data)));

		// return int for data size or boolean false for fail
		if ($id) {
			$this->set_timeout($name, $timeout);
			return shmop_write($id, serialize($data), 0);
		}
		else return false;
	}
	public function get_cache($name) {
		if (!check_timeout($name)) {
			$id=shmop_open($this->get_cache_id($name), "a", 0, 0);

			if ($id) $data=unserialize(shmop_read($id, 0, shmop_size($id)));
			else return false;          // failed to load data

			if ($data) {                // array retrieved
				shmop_close();
				return $data;
			}
			else return false;          // failed to load data
		}
		else return false;              // data was expired
	}
	public function get_cache_id($name) {
		// maintain list of caches here
		$id=array('test1' => 1, 'test2' => 2 );
		return $id[$name];
	}
	//
	public function set_timeout($name, $int) {
		$timeout=new DateTime(date('Y-m-d H:i:s'));
		date_add($timeout, date_interval_create_from_date_string("$int seconds"));
		$timeout=date_format($timeout, 'YmdHis');

		$id=shmop_open(100, "a", 0, 0);
		if ($id) $tl=unserialize(shmop_read($id, 0, shmop_size($id)));
		else $tl=array();
		shmop_delete($id);
		shmop_close($id);

		$tl[$name]=$timeout;
		$id=shmop_open(100, "c", 0644, strlen(serialize($tl)));
		shmop_write($id, serialize($tl), 0);
	}
	public function check_timeout($name) {
		$now=new DateTime(date('Y-m-d H:i:s'));
		$now=date_format($now, 'YmdHis');

		$id=shmop_open(100, "a", 0, 0);
		if ($id) $tl=unserialize(shmop_read($id, 0, shmop_size($id)));
		else return true;
		shmop_close($id);

		$timeout=$tl[$name];
		return (intval($now)>intval($timeout));
	}
	*/
	// ############################### //