php < 5.3.2中没有提供ReflectionMethod::setAccessible，那怎么获取私有属性呢？@qiyuuu
function getPrivatePropertyOfObj($obj, $name) {
$arr = (array)$obj;
$key = \0 . get_class($obj) . \0 . $name;
return isset($arr[$key]) ? $arr[$key] : null;
}
function getProtectedPropertyOfObj($obj, $name) {
$arr = (array)$obj;
$key = \0*\0 . $name;
return isset($arr[$key]) ? $arr[$key] : null;
}