data_get的key麻烦强制转换下为字符串，比如__toString()这样的特性就可以用到了

[aogg]

/**
 * Get an item from an array or object using "dot" notation.
 *
 * @param mixed $target
 * @param null|array|int|string $key
 * @param mixed $default
 * @return mixed
 */
function data_get($target, $key, $default = null)
{
    if (is_null($key)) {
        return $target;
    }

    $key = is_array($key) ? $key : explode('.', strval($key));