Drupal 7 pass multiple fields - drupal-7

Question

How I can pass multiple field values through $data and render them using $items.
Please see the below code snippet:
function custom_block_view($delta = '') {
global $user;
$account = $user;
$block['content'] = t('Hello #user from IP #host',array(
'#user' => format_username($user),
'#host' => $account->hostname
));
$result = db_select('node','a')
->fields('a', array('title', 'nid', 'status'))
->execute();
foreach($result as $node) {
$items[] = array(
'data' => t($node->title)
);
}
$block['content'] .= theme('item_list', array(
'items' => $items
));
return $block;
}

Answer 1

I found the how to pass another value through $data. Just adding a simple concatenation symbol (.)
Please check the below snippet.
foreach($result as $node) {
$items[] = array(
'data' => t($node->title).t($node->nid)
);
}

Answer 2

You can only use renderable array or string containing rendered HTML content.
content: The content of the block's body. This may be a renderable array (preferable) or a string containing rendered HTML content.
You can refer this link for more info:
hook_block_view
Drupal 7 Render Arrays
Altering
Both blocks and pages can be altered just as forms have been alterable for some time. Many other types are also alterable. With hook_page_alter() we can do things like this:
function mymodule_page_alter(&$page) {
// Move search form into the footer.
$page['footer']['search_form'] = $page['sidebar_first']['search_form'];
unset($page['sidebar_first']['search_form']);
// Remove the "powered by Drupal" block
unset($page['footer']['system_powered-by']);
}