Preprocess variables for page.tpl.php
Most themes utilize their own copy of page.tpl.php. The default is located inside "modules/system/page.tpl.php". Look in there for the full list of variables.
Uses the arg() function to generate a series of page template suggestions based on the current path.
Any changes to variables in this preprocessor should also be changed inside template_preprocess_maintenance_page() to keep all of them consistent.
function template_preprocess_page(&$variables) {
$language_interface = language(LANGUAGE_TYPE_INTERFACE);
$site_config = config('system.site');
// Move some variables to the top level for themer convenience and template cleanliness.
$variables['show_messages'] = $variables['page']['#show_messages'];
foreach (system_region_list($GLOBALS['theme']) as $region_key => $region_name) {
if (!isset($variables['page'][$region_key])) {
$variables['page'][$region_key] = array();
}
}
// Set up layout variable.
$variables['layout'] = 'none';
if (!empty($variables['page']['sidebar_first'])) {
$variables['layout'] = 'first';
}
if (!empty($variables['page']['sidebar_second'])) {
$variables['layout'] = $variables['layout'] == 'first' ? 'both' : 'second';
}
$variables['base_path'] = base_path();
$variables['front_page'] = url();
$variables['feed_icons'] = drupal_get_feeds();
$variables['language'] = $language_interface;
$variables['language']->dir = $language_interface->direction ? 'rtl' : 'ltr';
$variables['logo'] = theme_get_setting('logo');
$variables['main_menu'] = theme_get_setting('toggle_main_menu') ? menu_main_menu() : array();
$variables['secondary_menu'] = theme_get_setting('toggle_secondary_menu') ? menu_secondary_menu() : array();
$variables['action_links'] = menu_local_actions();
$variables['site_name'] = theme_get_setting('toggle_name') ? check_plain($site_config
->get('name')) : '';
$variables['site_slogan'] = theme_get_setting('toggle_slogan') ? filter_xss_admin($site_config
->get('slogan')) : '';
$variables['tabs'] = menu_local_tabs();
if ($node = menu_get_object()) {
$variables['node'] = $node;
}
// Populate the page template suggestions.
if ($suggestions = theme_get_suggestions(arg(), 'page')) {
$variables['theme_hook_suggestions'] = $suggestions;
}
}