public static function instance($classname, $method = '', $args = array())
{
static $instances = array();
$id = empty($args) ? strtolower($classname . $method) : strtolower($classname . $method . zotop::guid($args));
if (!isset($instances[$id])) {
if (class_exists($classname)) {
$instance = new $classname();
if (method_exists($instance, $method)) {
$instances[$id] = call_user_func_array(array(&$instance, $method), $args);
} else {
$instances[$id] = $instance;
}
} else {
msg::error($classname . ' not found!');
}
}
return $instances[$id];
}
