function hook_page_build
Add elements to a page before it is rendered.
Use this hook when you want to add elements at the page level. For your additions to be printed, they have to be placed below a top level array key of the $page array that has the name of a region of the active theme.
By default, valid region keys are 'page_top', 'header', 'sidebar_first', 'content', 'sidebar_second' and 'page_bottom'. To get a list of all regions of the active theme, use system_region_list($theme). Note that $theme is a global variable.
If you want to alter the elements added by other modules or if your module depends on the elements of other modules, use hook_page_alter() instead which runs after this hook.
Parameters
$page: Nested array of renderable elements that make up the page.
See also
Related topics
4 functions implement hook_page_build()
Note: the procedural functions in this list are found by pattern matching, so the list may include some functions that are not actually implementations of this hook.
- block_page_build in modules/
block/ block.module  - Implements hook_page_build().
 - dashboard_page_build in modules/
dashboard/ dashboard.module  - Implements hook_page_build().
 - system_test_page_build in modules/
simpletest/ tests/ system_test.module  - Implements hook_page_build().
 - toolbar_page_build in modules/
toolbar/ toolbar.module  - Implements hook_page_build().
 
1 invocation of hook_page_build()
- drupal_render_page in includes/
common.inc  - Renders the page, including all theming.
 
File
- 
              modules/
system/ system.api.php, line 905  
Code
function hook_page_build(&$page) {
  if (menu_get_object('node', 1)) {
    // We are on a node detail page. Append a standard disclaimer to the
    // content region.
    $page['content']['disclaimer'] = array(
      '#markup' => t('Acme, Inc. is not responsible for the contents of this sample code.'),
      '#weight' => 25,
    );
  }
}
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