D7 hook_block_info角色控制block

$blocks = array();
//Block for the Normal Site Owners
$blocks['payouts'] = array(
??? 'info' => t('Listing of Payouts'),
??? 'cache' => DRUPAL_NO_CACHE,

);
//Block for the Administrators
$blocks['commission_payments'] = array(
??? .....
??????????? .....
);

?

?

function hook_block_view($delta = '') {
? global $user;
? $block = array();

? switch ($delta) {
??? case 'payouts':
????? if (in_array('Admin', array_values($user->roles))) {
??????? $block['content'] = t('Hello Admin');
????? }
????? break;

??? case 'commission_payments':
????? if (in_array('Site Owner', array_values($user->roles))) {
??????? $block['content'] = t('Hello Site Owner');
????? }
????? break;
? }

? return $block;
}