Facade 包装类 -- 解决视图里面长长的命名空间调用问题

 * // 初始化
 * ZGFacade::setZGFacade('form', 'Aert_Form');
 * ZGFacade::setZGFacade('esClient', '\Elasticsearch\Client');
 * 
 * // 使用demo
 * $form = ZGFacade::newInstance('form', 'frm2', 'delete');
 * dump($form);
 * 
 * echo ZGFacade::server('form', 'REQUEST_METHOD');
 * echo ZGFacade::get('form', 'a');
 * 
 * $dsn      = Config::get('esken.dsn');
 * $esClient = ZGFacade::newInstance('esClient', $dsn);
 * dump($esClient);
 * 
 * @author vb2005xu@qq.com
 */
final class ZGFacade
{
private static $map = [
'form'=> 'Aert_Form'
];
public static function setZGFacade($alias, $class)
{
self::$map[ $alias ] = $class;
}
private static function __facade__($facade, $method, $arguments=[])
{
if ( is_object($facade) )
{
// 调用 对象方法
return call_user_func_array( [$facade, $method], $arguments );
}
else if (is_string($facade))
{
if ( empty(self::$map[$facade]) )
{
throw new Exception("未定义 'facade': {$facade} ");
}
// 调用 静态方法
if ( 'newInstance' == $method )
   {
   $class = new ReflectionClass( self::$map[$facade] );
   return $class->newInstanceArgs( $arguments );
   }
$class = self::$map[$facade];
return call_user_func_array( [$class, $method], $arguments );
}
throw new Exception("无效 'facade' 调用!");
}
public function __call($method, $arguments) 
    {
    $facade = array_shift($arguments);
    return self::__facade__($facade, $method, $arguments);
    }
    public static function __callStatic($method, $arguments) 
    {
    $facade = array_shift($arguments);    
    return self::__facade__($facade, $method, $arguments);
    }
}