在数组本身中使用使用全局数组的函数

I have the following code:

我有以下代码：

$conf = array(
'site'  => array(
    'theme'         => 'master',
    ),
'url'   => array(
    'site'          => 'localhost',
    'up'            => conf('url.site')    . '/uploads',
    'admin'         => conf('url.site')    . '/admin',
    'theme'         => conf('url.site')    . '/theme/' . conf('site.theme'),
    )
);
$conf =